diff --git a/build.gradle.kts b/build.gradle.kts
index 5b2e5140..bf83d447 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -101,15 +101,15 @@ plugins {
     base
 }
 
-allprojects {
-    group = "at.mocode.meldestelle"
-    version = "0.1.0-SNAPSHOT"
-
-    repositories {
-        mavenCentral()
-        google() // Wichtig für Compose-Abhängigkeiten
-    }
-}
+//allprojects {
+//    group = "at.mocode.meldestelle"
+//    version = "0.1.0-SNAPSHOT"
+//
+//    repositories {
+//        mavenCentral()
+//        google() // Wichtig für Compose-Abhängigkeiten
+//    }
+//}
 
 subprojects {
     // Konfigurationen, die für alle Untermodule gelten.
diff --git a/core/core-domain/build.gradle.kts b/core/core-domain/build.gradle.kts
index dd2a5bd0..edfd636a 100644
--- a/core/core-domain/build.gradle.kts
+++ b/core/core-domain/build.gradle.kts
@@ -1,34 +1,30 @@
 plugins {
-    // Definiert dieses Modul als ein Standard Kotlin/JVM-Modul.
-    alias(libs.plugins.kotlin.jvm)
-    // Aktiviert das Kotlinx Serialization Plugin, da unsere DTOs und Enums
-    // als @Serializable markiert sind.
+    // KORREKTUR: Von JVM zu Multiplattform wechseln
+    alias(libs.plugins.kotlin.multiplatform)
     alias(libs.plugins.kotlin.serialization)
 }
 
-dependencies {
-    // Stellt sicher, dass dieses Modul die zentralen Versionen aus unserem BOM (Bill of Materials)
-    // im platform-Modul respektiert. `api` wird verwendet, damit abhängige Module
-    // diese Platform-Definitionen ebenfalls "erben".
-    api(projects.platform.platformDependencies)
+// KORREKTUR: Diesen Block hinzufügen, um die Ziele zu definieren
+kotlin {
+    jvm()
+    js(IR) {
+        browser()
+    }
 
-    // --- Kern-Abhängigkeiten für das Domänen-Modell ---
-    // Diese Bibliotheken definieren die grundlegenden Datentypen unseres Modells.
-    // Wir verwenden `api` anstelle von `implementation`, damit Services, die
-    // `core-domain` einbinden, diese Typen ebenfalls direkt nutzen können.
-
-    // Stellt den `Uuid`-Typ für unsere eindeutigen IDs bereit.
-    api(libs.uuid)
-
-    // Stellt die `kotlinx.serialization`-Engine bereit, insbesondere für JSON.
-    api(libs.kotlinx.serialization.json)
-
-    // Stellt moderne Datums- und Zeit-Typen wie `Instant` und `LocalDate` bereit.
-    api(libs.kotlinx.datetime)
-
-    // --- Testing ---
-    // Stellt die notwendigen Bibliotheken für das Schreiben von Tests bereit.
-    // `testImplementation` sorgt dafür, dass diese Bibliotheken nicht Teil
-    // des finalen produktiven Codes werden.
-    testImplementation(projects.platform.platformTesting)
+    sourceSets {
+        val commonMain by getting {
+            dependencies {
+                // Die Abhängigkeiten kommen hier rein
+                api(projects.platform.platformDependencies)
+                api(libs.uuid)
+                api(libs.kotlinx.serialization.json)
+                api(libs.kotlinx.datetime)
+            }
+        }
+        val commonTest by getting {
+            dependencies {
+                implementation(projects.platform.platformTesting)
+            }
+        }
+    }
 }
diff --git a/core/core-utils/build.gradle.kts b/core/core-utils/build.gradle.kts
index b966f049..5c325eab 100644
--- a/core/core-utils/build.gradle.kts
+++ b/core/core-utils/build.gradle.kts
@@ -1,36 +1,41 @@
 plugins {
-    // Wendet das Kotlin JVM Plugin über den zentralen Alias an.
-    alias(libs.plugins.kotlin.jvm)
+    // KORREKTUR: Von JVM zu Multiplattform wechseln
+    alias(libs.plugins.kotlin.multiplatform)
 }
 
-dependencies {
-    // Stellt sicher, dass dieses Modul die zentralen Versionen aus unserem BOM respektiert.
-    api(projects.platform.platformDependencies)
+kotlin {
+    jvm()
+    js(IR) {
+        browser()
+    }
 
-    // Stellt die reinen Domänen-Klassen und -Interfaces aus dem `core-domain`-Modul bereit.
-    // `api` ist hier zwingend, da `core-utils` eine Implementierung von `core-domain` ist.
-    api(projects.core.coreDomain)
-
-    // --- Coroutines & Asynchronität ---
-    api(libs.kotlinx.coroutines.core)
-
-    // --- Datenbank-Management ---
-    api(libs.exposed.core)
-    api(libs.exposed.dao)
-    api(libs.exposed.jdbc)
-    api(libs.exposed.kotlin.datetime) // exposed-kotlin-datetime -> exposed.kotlin.datetime
-    // KORREKTUR: Der Alias `hikari-cp` wird zu `hikariCp` umgewandelt.
-    api(libs.hikari.cp)
-    api(libs.flyway.core)
-    api(libs.flyway.postgresql)
-
-    // --- Service Discovery ---
-    api(libs.consul.client)
-
-    // --- Utilities ---
-    // Stellt die BigDecimal-Implementierung für den Serializer bereit.
-    api(libs.bignum)
-
-    // --- Testing ---
-    testImplementation(projects.platform.platformTesting)
+    sourceSets {
+        val commonMain by getting {
+            dependencies {
+                // Diese sind plattformunabhängig und können geteilt werden
+                api(projects.platform.platformDependencies)
+                api(projects.core.coreDomain)
+                api(libs.kotlinx.coroutines.core)
+                api(libs.bignum)
+            }
+        }
+        val jvmMain by getting {
+            dependencies {
+                // DIESE SIND NUR FÜR DIE JVM!
+                api(libs.exposed.core)
+                api(libs.exposed.dao)
+                api(libs.exposed.jdbc)
+                api(libs.exposed.kotlin.datetime)
+                api(libs.hikari.cp)
+                api(libs.flyway.core)
+                api(libs.flyway.postgresql)
+                api(libs.consul.client)
+            }
+        }
+        val commonTest by getting {
+            dependencies {
+                implementation(projects.platform.platformTesting)
+            }
+        }
+    }
 }
diff --git a/core/core-utils/src/main/kotlin/at/mocode/core/utils/discovery/ServiceRegistration.kt b/core/core-utils/src/main/kotlin/at/mocode/core/utils/discovery/ServiceRegistration.kt
index a6d00432..432aabde 100644
--- a/core/core-utils/src/main/kotlin/at/mocode/core/utils/discovery/ServiceRegistration.kt
+++ b/core/core-utils/src/main/kotlin/at/mocode/core/utils/discovery/ServiceRegistration.kt
@@ -21,12 +21,13 @@ class ServiceRegistration internal constructor(
     fun register() {
         if (isRegistered) return
         try {
+            // Der `register`-Aufruf ist korrekt, da das `registration`-Objekt
+            // bereits außerhalb vollständig und korrekt gebaut wurde.
             consul.agentClient().register(registration)
             isRegistered = true
             println("Service '${registration.name()}' mit ID '${registration.id()}' erfolgreich bei Consul registriert.")
         } catch (e: Exception) {
             println("FEHLER: Service-Registrierung bei Consul fehlgeschlagen: ${e.message}")
-            // Fehler weiterwerfen, um den Anwendungsstart zu stoppen
             throw IllegalStateException("Could not register service with Consul", e)
         }
     }
@@ -34,6 +35,7 @@ class ServiceRegistration internal constructor(
     fun deregister() {
         if (!isRegistered) return
         try {
+            // Der `deregister`-Aufruf ist korrekt. Er erwartet die Service-ID als einfachen String.
             consul.agentClient().deregister(registration.id())
             isRegistered = false
             println("Service '${registration.name()}' mit ID '${registration.id()}' erfolgreich bei Consul deregistriert.")
@@ -66,7 +68,8 @@ class ServiceRegistrar(private val appConfig: AppConfig) {
         val serviceId = "$serviceName-${UUID.randomUUID()}"
         val hostAddress = InetAddress.getLocalHost().hostAddress
 
-        // KORREKTUR: Der Aufruf erfolgt über die `Registration`-Klasse, nicht `ImmutableRegistration`.
+        // KORREKTUR: Der Health Check MUSS über die statische Factory-Methode `http`
+        // der `Registration.RegCheck`-Klasse erstellt werden. Dies war die Hauptfehlerquelle.
         val healthCheck = Registration.RegCheck.http(
             "http://$hostAddress:$servicePort/health", // Standard-Health-Check-Pfad
             10L, // Intervall in Sekunden
diff --git a/events/events-api/build.gradle.kts b/events/events-api/build.gradle.kts
index 7087964c..7c46a59b 100644
--- a/events/events-api/build.gradle.kts
+++ b/events/events-api/build.gradle.kts
@@ -1,10 +1,12 @@
 plugins {
-    // KORREKTUR: Alle Plugins werden jetzt konsistent über den Version Catalog geladen.
     alias(libs.plugins.kotlin.jvm)
     alias(libs.plugins.kotlin.spring)
     alias(libs.plugins.kotlin.serialization)
     alias(libs.plugins.ktor)
     application
+
+    // KORREKTUR 1: Dieses Plugin hinzufügen, um die Spring-BOM zu aktivieren.
+    alias(libs.plugins.spring.dependencyManagement)
 }
 
 application {
@@ -12,17 +14,19 @@ application {
 }
 
 dependencies {
-    // Deine Abhängigkeiten sind hier bereits korrekt und benötigen keine Änderung.
-    implementation(projects.platform.platformDependencies)
+    // KORREKTUR 2: Die Spring-Boot-BOM hier explizit als Plattform deklarieren.
+    api(platform(libs.spring.boot.dependencies))
 
+    // Bestehende Abhängigkeiten
+    implementation(projects.platform.platformDependencies)
     implementation(projects.events.eventsDomain)
     implementation(projects.events.eventsApplication)
     implementation(projects.core.coreDomain)
     implementation(projects.core.coreUtils)
 
-    // Spring dependencies
-    implementation("org.springframework:spring-web")
-    implementation("org.springdoc:springdoc-openapi-starter-common")
+    // Spring dependencies (jetzt mit korrekter Version aus der BOM)
+    implementation(libs.spring.web)
+    implementation(libs.springdoc.openapi.starter.common)
 
     // Ktor Server
     implementation(libs.ktor.server.core)
diff --git a/events/events-application/build.gradle.kts b/events/events-application/build.gradle.kts
index a580f03f..25b230c9 100644
--- a/events/events-application/build.gradle.kts
+++ b/events/events-application/build.gradle.kts
@@ -1,10 +1,32 @@
 plugins {
-    kotlin("jvm")
+    // KORREKTUR: Von 'kotlin("jvm")' zu Multiplattform wechseln.
+    alias(libs.plugins.kotlin.multiplatform)
+    alias(libs.plugins.kotlin.serialization)
 }
 
-dependencies {
-    implementation(projects.events.eventsDomain)
-    implementation(projects.core.coreDomain)
-    implementation(projects.core.coreUtils)
-    testImplementation(projects.platform.platformTesting)
+kotlin {
+    jvm()
+    js(IR) {
+        browser()
+    }
+
+    sourceSets {
+        val commonMain by getting {
+            dependencies {
+                // Hier die jeweiligen Modul-Abhängigkeiten eintragen
+                // z.B. für events-domain:
+                implementation(projects.core.coreDomain)
+
+                // z.B. für events-application:
+                // implementation(projects.events.eventsDomain)
+            }
+        }
+
+        val commonTest by getting {
+            dependencies {
+                implementation(kotlin("test"))
+                implementation(projects.platform.platformTesting)
+            }
+        }
+    }
 }
diff --git a/events/events-infrastructure/build.gradle.kts b/events/events-infrastructure/build.gradle.kts
index ab4b049a..11768533 100644
--- a/events/events-infrastructure/build.gradle.kts
+++ b/events/events-infrastructure/build.gradle.kts
@@ -17,8 +17,8 @@ dependencies {
     implementation(projects.infrastructure.eventStore.eventStoreApi)
     implementation(projects.infrastructure.messaging.messagingClient)
 
-    implementation("org.springframework.boot:spring-boot-starter-data-jpa")
-    implementation("org.postgresql:postgresql")
+    implementation(libs.spring.boot.starter.data.jpa)
+    implementation(libs.postgresql.driver)
 
     testImplementation(projects.platform.platformTesting)
 }
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index d0d0c7a5..59d464cc 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -5,27 +5,29 @@
 [versions]
 # --- Kotlin Ecosystem ---
 kotlin = "2.2.0"
-kotlinxCoroutines = "1.9.1"
-kotlinxSerialization = "1.7.1"
-kotlinxDatetime = "0.6.0"
+kotlinx = "1.9.0"
+kotlinxDatetime = "0.7.1"
+kotlinLogging = "3.0.5"
 
 # --- Spring Ecosystem ---
 springBoot = "3.2.5"
 springDependencyManagement = "1.1.5"
 springdoc = "2.5.0"
 
-# --- Compose UI ---
-composeMultiplatform = "1.6.10"
-
 # --- Ktor (API Layer & Client) ---
 ktor = "3.0.0-beta-2"
 
+# --- Compose UI ---
+composeMultiplatform = "1.6.10"
+
 # --- Database & Persistence ---
 exposed = "0.51.1"
 postgresql = "42.7.3"
 hikari = "5.1.0"
 h2 = "2.2.224"
 flyway = "10.15.2"
+redisson = "3.27.2"
+lettuce = "6.3.1.RELEASE"
 
 # --- Service Discovery & Monitoring ---
 consulClient = "1.5.3"
@@ -33,20 +35,34 @@ micrometer = "1.12.2"
 
 # --- Testing ---
 junitJupiter = "5.10.2"
+mockk = "1.13.8"
+assertj = "3.24.2"
+testcontainers = "1.19.6"
 
 # --- Utilities ---
 uuid = "0.8.4"
 bignum = "0.3.9"
 logback = "1.5.6"
+caffeine = "3.1.8"
+reactorKafka = "1.3.22"
+jackson = "2.17.0"
+jakartaAnnotation = "2.1.1"
+auth0Jwt = "4.4.0"
 
 [libraries]
+# --- Platform BOMs (Bill of Materials) ---
+kotlin-bom = { module = "org.jetbrains.kotlin:kotlin-bom", version.ref = "kotlin" }
+kotlinx-coroutines-bom = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-bom", version.ref = "kotlinx" }
+spring-boot-dependencies = { module = "org.springframework.boot:spring-boot-dependencies", version.ref = "springBoot" }
+
 # --- Kotlin & Coroutines ---
 kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test", version.ref = "kotlin" }
-kotlinx-coroutines-core = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-core", version.ref = "kotlinxCoroutines" }
-kotlinx-coroutines-swing = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-swing", version.ref = "kotlinxCoroutines" }
-kotlinx-coroutines-test = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-test", version.ref = "kotlinxCoroutines" }
-kotlinx-serialization-json = { module = "org.jetbrains.kotlinx:kotlinx-serialization-json", version.ref = "kotlinxSerialization" }
+kotlinx-coroutines-core = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-core", version.ref = "kotlinx" }
+kotlinx-coroutines-swing = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-swing", version.ref = "kotlinx" }
+kotlinx-coroutines-reactor = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-reactor", version.ref = "kotlinx" }
+kotlinx-serialization-json = { module = "org.jetbrains.kotlinx:kotlinx-serialization-json", version.ref = "kotlinx" }
 kotlinx-datetime = { module = "org.jetbrains.kotlinx:kotlinx-datetime", version.ref = "kotlinxDatetime" }
+kotlinx-coroutines-test = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-test", version.ref = "kotlinx" }
 
 # --- Ktor Server ---
 ktor-server-core = { module = "io.ktor:ktor-server-core-jvm", version.ref = "ktor" }
@@ -78,6 +94,9 @@ spring-boot-starter-validation = { module = "org.springframework.boot:spring-boo
 spring-boot-starter-actuator = { module = "org.springframework.boot:spring-boot-starter-actuator" }
 spring-boot-starter-data-jpa = { module = "org.springframework.boot:spring-boot-starter-data-jpa" }
 spring-boot-starter-test = { module = "org.springframework.boot:spring-boot-starter-test" }
+spring-boot-starter-oauth2-client = { module = "org.springframework.boot:spring-boot-starter-oauth2-client" }
+spring-boot-starter-security = { module = "org.springframework.boot:spring-boot-starter-security" }
+spring-security-oauth2-jose = { module = "org.springframework.security:spring-security-oauth2-jose" }
 spring-web = { module = "org.springframework:spring-web" }
 springdoc-openapi-starter-common = { module = "org.springdoc:springdoc-openapi-starter-common", version.ref = "springdoc" }
 springdoc-openapi-starter-webmvc-ui = { module = "org.springdoc:springdoc-openapi-starter-webmvc-ui", version.ref = "springdoc" }
@@ -92,6 +111,8 @@ hikari-cp = { module = "com.zaxxer:HikariCP", version.ref = "hikari" }
 h2-driver = { module = "com.h2database:h2", version.ref = "h2" }
 flyway-core = { module = "org.flywaydb:flyway-core", version.ref = "flyway" }
 flyway-postgresql = { module = "org.flywaydb:flyway-database-postgresql", version.ref = "flyway" }
+redisson = { module = "org.redisson:redisson", version.ref = "redisson" }
+lettuce-core = { module = "io.lettuce:lettuce-core", version.ref = "lettuce" }
 
 # --- Service Discovery & Monitoring ---
 consul-client = { module = "com.orbitz.consul:consul-client", version.ref = "consulClient" }
@@ -101,6 +122,13 @@ micrometer-prometheus = { module = "io.micrometer:micrometer-registry-prometheus
 uuid = { module = "com.benasher44:uuid", version.ref = "uuid" }
 bignum = { module = "com.ionspin.kotlin:bignum", version.ref = "bignum" }
 logback-classic = { module = "ch.qos.logback:logback-classic", version.ref = "logback" }
+kotlin-logging-jvm = { module = "io.github.microutils:kotlin-logging-jvm", version.ref = "kotlinLogging" }
+caffeine = { module = "com.github.ben-manes.caffeine:caffeine", version.ref = "caffeine" }
+reactor-kafka = { module = "io.projectreactor.kafka:reactor-kafka", version.ref = "reactorKafka" }
+jackson-module-kotlin = { module = "com.fasterxml.jackson.module:jackson-module-kotlin", version.ref = "jackson" }
+jackson-datatype-jsr310 = { module = "com.fasterxml.jackson.datatype:jackson-datatype-jsr310", version.ref = "jackson" }
+jakarta-annotation-api = { module = "jakarta.annotation:jakarta.annotation-api", version.ref = "jakartaAnnotation" }
+auth0-java-jwt = { module = "com.auth0:java-jwt", version.ref = "auth0Jwt" }
 
 # --- Compose UI ---
 compose-runtime = { module = "org.jetbrains.compose.runtime:runtime", version.ref = "composeMultiplatform" }
@@ -112,9 +140,17 @@ compose-materialIconsExtended = { module = "org.jetbrains.compose.material:mater
 compose-html-core = { module = "org.jetbrains.compose.html:html-core", version.ref = "composeMultiplatform" }
 compose-desktop-currentOs = { module = "org.jetbrains.compose.desktop:desktop", version.ref = "composeMultiplatform" }
 
-# --- Testing (JUnit 5) ---
+# --- Testinging ---
 junit-jupiter-api = { module = "org.junit.jupiter:junit-jupiter-api", version.ref = "junitJupiter" }
 junit-jupiter-engine = { module = "org.junit.jupiter:junit-jupiter-engine", version.ref = "junitJupiter" }
+junit-jupiter-params = { module = "org.junit.jupiter:junit-jupiter-params", version.ref = "junitJupiter" }
+junit-platform-launcher = { module = "org.junit.platform:junit-platform-launcher", version.ref = "junitJupiter" }
+mockk = { module = "io.mockk:mockk", version.ref = "mockk" }
+assertj-core = { module = "org.assertj:assertj-core", version.ref = "assertj" }
+testcontainers-core = { module = "org.testcontainers:testcontainers", version.ref = "testcontainers" }
+testcontainers-junit-jupiter = { module = "org.testcontainers:junit-jupiter", version.ref = "testcontainers" }
+testcontainers-postgresql = { module = "org.testcontainers:postgresql", version.ref = "testcontainers" }
+
 
 [plugins]
 kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
diff --git a/infrastructure/auth/auth-client/build.gradle.kts b/infrastructure/auth/auth-client/build.gradle.kts
index dc755813..701d39d3 100644
--- a/infrastructure/auth/auth-client/build.gradle.kts
+++ b/infrastructure/auth/auth-client/build.gradle.kts
@@ -18,13 +18,10 @@ dependencies {
     implementation(projects.core.coreDomain)
     implementation(projects.core.coreUtils)
 
-    // Spring Security
-    implementation("org.springframework.boot:spring-boot-starter-oauth2-client")
-    implementation("org.springframework.boot:spring-boot-starter-security")
-    implementation("org.springframework.security:spring-security-oauth2-jose")
-
-    // JWT
-    implementation("com.auth0:java-jwt:4.4.0")
+    implementation(libs.spring.boot.starter.oauth2.client)
+    implementation(libs.spring.boot.starter.security)
+    implementation(libs.spring.security.oauth2.jose)
+    implementation(libs.auth0.java.jwt)
 
     testImplementation(projects.platform.platformTesting)
 }
diff --git a/infrastructure/gateway/build.gradle.kts b/infrastructure/gateway/build.gradle.kts
index 382376b1..783570c2 100644
--- a/infrastructure/gateway/build.gradle.kts
+++ b/infrastructure/gateway/build.gradle.kts
@@ -3,6 +3,7 @@ plugins {
     alias(libs.plugins.kotlin.serialization)
     alias(libs.plugins.ktor)
     application
+    alias(libs.plugins.spring.dependencyManagement)
 }
 
 application {
@@ -10,6 +11,7 @@ application {
 }
 
 dependencies {
+    api(platform(libs.spring.boot.dependencies))
     // --- Interne Module ---
     // Der Gateway benötigt nur die Kern-Definitionen und Utilities.
     implementation(projects.platform.platformDependencies)
diff --git a/masterdata/masterdata-api/build.gradle.kts b/masterdata/masterdata-api/build.gradle.kts
index 480228c9..74e2be31 100644
--- a/masterdata/masterdata-api/build.gradle.kts
+++ b/masterdata/masterdata-api/build.gradle.kts
@@ -5,6 +5,7 @@ plugins {
     alias(libs.plugins.kotlin.serialization)
     alias(libs.plugins.ktor)
     application
+    alias(libs.plugins.spring.dependencyManagement)
 }
 
 application {
@@ -12,6 +13,7 @@ application {
 }
 
 dependencies {
+    api(platform(libs.spring.boot.dependencies))
     // Interne Module
     implementation(projects.platform.platformDependencies)
     implementation(projects.masterdata.masterdataDomain)
diff --git a/masterdata/masterdata-domain/build.gradle.kts b/masterdata/masterdata-domain/build.gradle.kts
index c9be78e5..89790406 100644
--- a/masterdata/masterdata-domain/build.gradle.kts
+++ b/masterdata/masterdata-domain/build.gradle.kts
@@ -1,9 +1,27 @@
 plugins {
-    kotlin("jvm")
+    alias(libs.plugins.kotlin.multiplatform)
+    alias(libs.plugins.kotlin.serialization)
 }
 
-dependencies {
-    implementation(projects.core.coreDomain)
-    implementation(projects.core.coreUtils)
-    testImplementation(projects.platform.platformTesting)
+kotlin {
+    jvm()
+    js(IR) {
+        browser()
+    }
+
+    sourceSets {
+        val commonMain by getting {
+            dependencies {
+                // KORREKTUR: Diese zwei Zeilen hinzufügen
+                implementation(projects.core.coreDomain)
+                implementation(projects.core.coreUtils)
+            }
+        }
+        val commonTest by getting {
+            dependencies {
+                implementation(kotlin("test"))
+                implementation(projects.platform.platformTesting)
+            }
+        }
+    }
 }
diff --git a/platform/platform-bom/build.gradle.kts b/platform/platform-bom/build.gradle.kts
index 23cdbe03..c58e4fcc 100644
--- a/platform/platform-bom/build.gradle.kts
+++ b/platform/platform-bom/build.gradle.kts
@@ -8,43 +8,51 @@ javaPlatform {
 }
 
 dependencies {
-    api(platform("org.springframework.boot:spring-boot-dependencies:3.2.3"))
-    api(platform("org.jetbrains.kotlin:kotlin-bom:2.1.21"))
-    api(platform("org.jetbrains.kotlinx:kotlinx-coroutines-bom:1.10.1"))
+    // KORREKTUR: Alle BOMs werden jetzt über Aliase aus der libs.versions.toml bezogen.
+    api(platform(libs.spring.boot.dependencies))
+    api(platform(libs.kotlin.bom))
+    api(platform(libs.kotlinx.coroutines.bom))
 
     constraints {
-        api("com.github.ben-manes.caffeine:caffeine:3.1.8")
-        api("io.projectreactor.kafka:reactor-kafka:1.3.22")
-        api("org.springdoc:springdoc-openapi-starter-webmvc-ui:2.3.0")
-        api("org.springdoc:springdoc-openapi-starter-webflux-ui:2.3.0")
-        api("org.springdoc:springdoc-openapi-starter-common:2.3.0")
-        api("org.redisson:redisson:3.27.2")
-        api("io.lettuce:lettuce-core:6.3.1.RELEASE")
-        api("io.github.microutils:kotlin-logging-jvm:3.0.5")
-        api("org.jetbrains.exposed:exposed-core:0.52.0")
-        api("org.jetbrains.exposed:exposed-dao:0.52.0")
-        api("org.jetbrains.exposed:exposed-jdbc:0.52.0")
-        api("org.jetbrains.exposed:exposed-kotlin-datetime:0.52.0")
-        api("org.postgresql:postgresql:42.7.3")
-        api("com.zaxxer:HikariCP:5.1.0")
-        api("com.h2database:h2:2.2.224")
-        api("org.jetbrains.kotlinx:kotlinx-serialization-json:1.8.1")
-        api("org.jetbrains.kotlinx:kotlinx-datetime:0.6.1")
-        api("com.benasher44:uuid:0.8.2")
-        api("com.ionspin.kotlin:bignum:0.3.8")
-        api("com.orbitz.consul:consul-client:1.5.3")
+        // KORREKTUR: Alle Abhängigkeiten verwenden jetzt Aliase.
+        // Keine einzige hartcodierte Version mehr in dieser Datei!
 
-        // Jackson modules
-        api("com.fasterxml.jackson.module:jackson-module-kotlin:2.17.0")
-        api("com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.17.0")
+        // --- Utilities & Other ---
+        api(libs.caffeine)
+        api(libs.reactor.kafka)
+        api(libs.redisson)
+        api(libs.uuid)
+        api(libs.bignum)
+        api(libs.consul.client)
+        api(libs.kotlin.logging.jvm)
+        api(libs.jakarta.annotation.api)
 
-        // Testcontainers
-        api("org.testcontainers:testcontainers:1.19.6")
-        api("org.testcontainers:junit-jupiter:1.19.6")
-        api("org.testcontainers:postgresql:1.19.6")
+        // --- Spring & SpringDoc ---
+        api(libs.springdoc.openapi.starter.common)
+        api(libs.springdoc.openapi.starter.webmvc.ui)
 
-        // Jakarta EE APIs
-        api("jakarta.annotation:jakarta.annotation-api:2.1.1")
+        // --- Database & Persistence ---
+        api(libs.exposed.core)
+        api(libs.exposed.dao)
+        api(libs.exposed.jdbc)
+        api(libs.exposed.kotlin.datetime)
+        api(libs.postgresql.driver)
+        api(libs.hikari.cp)
+        api(libs.h2.driver)
+        api(libs.lettuce.core)
+
+        // --- Kotlinx Libraries ---
+        api(libs.kotlinx.serialization.json)
+        api(libs.kotlinx.datetime)
+
+        // --- Jackson Modules ---
+        api(libs.jackson.module.kotlin)
+        api(libs.jackson.datatype.jsr310)
+
+        // --- Testcontainers ---
+        api(libs.testcontainers.core)
+        api(libs.testcontainers.junit.jupiter)
+        api(libs.testcontainers.postgresql)
     }
 }
 
diff --git a/platform/platform-dependencies/build.gradle.kts b/platform/platform-dependencies/build.gradle.kts
index c43c7301..4ab8baa8 100644
--- a/platform/platform-dependencies/build.gradle.kts
+++ b/platform/platform-dependencies/build.gradle.kts
@@ -1,16 +1,35 @@
 plugins {
-    `java-library`
-    kotlin("jvm")
+    alias(libs.plugins.kotlin.multiplatform)
 }
 
-dependencies {
-    api(platform(projects.platform.platformBom))
+kotlin {
+    jvm()
+    js(IR) {
+        browser()
+    }
 
-    api("org.jetbrains.kotlin:kotlin-stdlib")
-    api("org.jetbrains.kotlin:kotlin-reflect")
-    api("org.jetbrains.kotlinx:kotlinx-coroutines-core")
-    api("org.jetbrains.kotlinx:kotlinx-coroutines-reactor")
-    api("io.github.microutils:kotlin-logging-jvm")
-    api("org.jetbrains.kotlinx:kotlinx-serialization-json")
-    api("org.jetbrains.kotlinx:kotlinx-datetime")
+    sourceSets {
+        val commonMain by getting {
+            dependencies {
+                // KORREKTUR: Die explizite `platform()`-Abhängigkeit wird hier entfernt.
+                // Die Versionen aus der BOM werden trotzdem angewendet.
+
+                // KORREKTUR: `stdlib` und `reflect` werden entfernt.
+                // `stdlib` wird automatisch hinzugefügt.
+
+                api(libs.kotlinx.coroutines.core)
+                api(libs.kotlinx.serialization.json)
+                api(libs.kotlinx.datetime)
+            }
+        }
+
+        val jvmMain by getting {
+            dependencies {
+                api("org.jetbrains.kotlinx:kotlinx-coroutines-reactor")
+
+                // KORREKTUR: Hartcodierte Version durch Alias ersetzen
+                api(libs.kotlin.logging.jvm)
+            }
+        }
+    }
 }
diff --git a/platform/platform-testing/build.gradle.kts b/platform/platform-testing/build.gradle.kts
index 55890859..7147e5e3 100644
--- a/platform/platform-testing/build.gradle.kts
+++ b/platform/platform-testing/build.gradle.kts
@@ -1,36 +1,43 @@
 plugins {
-    `java-library`
-    kotlin("jvm")
+    // KORREKTUR: 'java-library' und 'kotlin("jvm")' ersetzen
+    alias(libs.plugins.kotlin.multiplatform)
 }
 
-dependencies {
-    api(platform(projects.platform.platformBom))
+kotlin {
+    // KORREKTUR: JVM- und JS-Ziele definieren
+    jvm()
+    js(IR) {
+        browser()
+    }
 
-    // Kotlin Test
-    api("org.jetbrains.kotlin:kotlin-test")
-    api("org.jetbrains.kotlin:kotlin-test-junit")
+    sourceSets {
+        // Diese Abhängigkeiten sind für alle Plattformen (JVM, JS) verfügbar
+        val commonTest by getting {
+            dependencies {
+                // Die 'kotlin("test")'-Abhängigkeit ist der Standardweg für KMP-Tests
+                implementation(kotlin("test"))
+                api(libs.kotlinx.coroutines.test)
+            }
+        }
 
-    // JUnit
-    api("org.junit.jupiter:junit-jupiter-api")
-    api("org.junit.jupiter:junit-jupiter-engine")
-    api("org.junit.jupiter:junit-jupiter-params")
-    api("org.junit.platform:junit-platform-launcher")
+        // Diese Abhängigkeiten sind NUR für die JVM-Tests verfügbar
+        val jvmTest by getting {
+            dependencies {
+                api(libs.junit.jupiter.api)
+                api(libs.junit.jupiter.engine)
+                api(libs.junit.jupiter.params)
+                api(libs.junit.platform.launcher)
 
-    // Mocking and Assertions
-    api("io.mockk:mockk:1.13.8")
-    api("org.assertj:assertj-core:3.24.2")
+                // KORREKTUR: Alle hartcodierten Versionen durch Aliase ersetzen
+                api(libs.mockk)
+                api(libs.assertj.core)
+                api(libs.spring.boot.starter.test)
+                api(libs.h2.driver)
 
-    // Coroutines Testing
-    api("org.jetbrains.kotlinx:kotlinx-coroutines-test")
-
-    // Spring Boot Testing
-    api("org.springframework.boot:spring-boot-starter-test")
-
-    // Database Testing
-    api("com.h2database:h2")
-
-    // Test Containers
-    api("org.testcontainers:testcontainers:1.19.5")
-    api("org.testcontainers:junit-jupiter:1.19.5")
-    api("org.testcontainers:postgresql:1.19.5")
+                api(libs.testcontainers.core)
+                api(libs.testcontainers.junit.jupiter)
+                api(libs.testcontainers.postgresql)
+            }
+        }
+    }
 }
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 54a241c1..d6aba257 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -16,7 +16,8 @@ pluginManagement {
 }
 
 dependencyResolutionManagement {
-    repositories {
+
+    /*repositories {
         mavenCentral()
         google {
             mavenContent {
@@ -33,6 +34,13 @@ dependencyResolutionManagement {
         maven {
             url = uri("https://oss.sonatype.org/content/repositories/snapshots/")
         }
+    }*/
+
+    repositories {
+        mavenCentral()
+        google()
+        maven { url = uri("https://jitpack.io") }
+        maven { url = uri("https://oss.sonatype.org/content/repositories/snapshots/") }
     }
 }