refactor(build): enable Wasm by default and refactor modules for improved KMP compatibility

Enabled Wasm target across all relevant modules and removed conditional enablement logic. Refactored `core:core-utils` to move JVM-specific code to a new `backend:infrastructure:persistence` module for strict KMP compliance. Updated dependencies, adjusted Gradle configurations, and resolved circular dependencies.

backend/services/ping/ping-api/build.gradle.kts

@@ -9,8 +9,6 @@ version = "1.0.0"
 kotlin {
     // Toolchain is now handled centrally in the root build.gradle.kts
 
-    val enableWasm = providers.gradleProperty("enableWasm").orNull == "true"
-
     // JVM target for backend usage
     jvm()
 
@@ -20,12 +18,10 @@ kotlin {
         // no need for binaries.executable() in a library
     }
 
-    // Optional Wasm target for browser clients
-    if (enableWasm) {
-        @OptIn(org.jetbrains.kotlin.gradle.ExperimentalWasmDsl::class)
-        wasmJs {
-            browser()
-        }
+    // Wasm enabled by default
+    @OptIn(org.jetbrains.kotlin.gradle.ExperimentalWasmDsl::class)
+    wasmJs {
+        browser()
     }
 
     sourceSets {

backend/services/ping/ping-service/build.gradle.kts

@@ -16,22 +16,21 @@ dependencies {
     // === Project Dependencies ===
     implementation(projects.backend.services.ping.pingApi)
     implementation(projects.platform.platformDependencies)
+    // NEU: Zugriff auf die verschobenen DatabaseUtils
+    implementation(projects.backend.infrastructure.persistence)
 
     // === Spring Boot & Cloud ===
     implementation(libs.bundles.spring.boot.service.complete)
     // WICHTIG: Da wir JPA (blockierend) nutzen, brauchen wir Spring MVC (nicht WebFlux)
     implementation(libs.spring.boot.starter.web)
 
-    // KORREKTUR: Bundle aufgelöst, da Accessor fehlschlägt
-    // libs.bundles.spring.cloud.gateway -> spring-cloud-gateway
-    implementation(libs.spring.cloud.starter.gateway.server.webflux)
+    // Service Discovery
     implementation(libs.spring.cloud.starter.consul.discovery)
 
     // === Database & Persistence ===
     implementation(libs.bundles.database.complete)
 
     // === Resilience ===
-    // KORREKTUR: Bundle aufgelöst
     implementation(libs.resilience4j.spring.boot3)
     implementation(libs.resilience4j.reactor)
     implementation(libs.spring.boot.starter.aop)