chore: refactor Gradle config, standardize Kotlin MPP plugin usage, and update dependencies

- Unified plugin application across modules using `alias(libs.plugins.*)` instead of hardcoded IDs.
- Removed redundant JVM/JS source map tasks, improving Gradle and Docker build consistency.
- Updated dependencies, including `logback` and Webpack `copy-webpack-plugin`, and added contextual documentation.
- Added frontend architecture diagram in PlantUML (`docs/01_Architecture/Reference`), standardizing feature-core-shell dependencies.

backend/infrastructure/persistence/build.gradle.kts

@@ -1,45 +1,37 @@
 plugins {
-    alias(libs.plugins.kotlinJvm)
-    alias(libs.plugins.kotlinJpa)
-    alias(libs.plugins.spring.boot) // Spring Boot Plugin hinzufügen
-    alias(libs.plugins.spring.dependencyManagement) // Dependency Management für Spring
+  alias(libs.plugins.kotlinJvm)
+  alias(libs.plugins.kotlinJpa)
+  alias(libs.plugins.spring.boot) // Spring Boot Plugin hinzufügen
+  alias(libs.plugins.spring.dependencyManagement) // Dependency Management für Spring
 }
 
 // Library module: do not create an executable Spring Boot jar here.
 tasks.bootJar {
-    enabled = false
+  enabled = false
 }
 
 // Ensure a regular jar is produced instead.
 tasks.jar {
-    enabled = true
+  enabled = true
 }
 
 dependencies {
-    implementation(platform(projects.platform.platformBom))
-    implementation(projects.core.coreUtils)
-    implementation(projects.core.coreDomain)
-    implementation(projects.platform.platformDependencies)
+  implementation(platform(projects.platform.platformBom))
+  implementation(projects.core.coreUtils)
+  implementation(projects.core.coreDomain)
+  implementation(projects.platform.platformDependencies)
 
-    // Spring Boot Database dependencies
-    implementation(libs.bundles.database.complete)
+  // Spring Boot Database dependencies
+  implementation(libs.bundles.database.complete)
 
-    // Exposed
-    implementation(libs.exposed.core)
-    implementation(libs.exposed.jdbc)
-    implementation(libs.exposed.dao)
-    implementation(libs.exposed.java.time)
-    implementation(libs.exposed.json)
-    implementation(libs.exposed.kotlin.datetime)
+  // Exposed
+  implementation(libs.exposed.core)
+  implementation(libs.exposed.jdbc)
+  implementation(libs.exposed.dao)
+  implementation(libs.exposed.java.time)
+  implementation(libs.exposed.json)
+  implementation(libs.exposed.kotlin.datetime)
 
-    // Logging
-    implementation(libs.slf4j.api)
-
-    // Testing
-    testImplementation(projects.platform.platformTesting)
-    testImplementation(libs.bundles.testing.jvm)
-}
-
-tasks.test {
-    useJUnitPlatform()
+  // Testing
+  testImplementation(projects.platform.platformTesting)
 }