feat(horses-service): remove legacy configuration and repository classes

- Deleted outdated `ApplicationConfiguration` and `HorseRepositoryImpl` classes.
- Migrated to streamlined modular Gradle configuration in `build.gradle.kts`.
- Updated domain models and dependencies to use multiplatform and serialization plugins.
- Added modular setup for `horses` namespace in `settings.gradle.kts`.
- Reorganized database configuration with minimal JDBC bindings for development.

Signed-off-by: Stefan Mogeritsch <stefan.mo.co@gmail.com>

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

@@ -1,12 +1,10 @@
 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.kotlinJvm)
+  alias(libs.plugins.kotlinSpring)
     alias(libs.plugins.spring.boot)
     alias(libs.plugins.spring.dependencyManagement)
 }
 
-// Der springBoot-Block konfiguriert die Anwendung, wenn sie als JAR-Datei ausgeführt wird.
 springBoot {
     mainClass.set("at.mocode.horses.service.HorsesServiceApplicationKt")
 }
@@ -17,16 +15,9 @@ dependencies {
     implementation(projects.core.coreDomain)
     implementation(projects.core.coreUtils)
     implementation(projects.horses.horsesDomain)
-    implementation(projects.horses.horsesApplication)
+  // horses-common: ON HOLD – veraltete API-Referenzen
+  // implementation(projects.horses.horsesCommon)
     implementation(projects.horses.horsesInfrastructure)
-    implementation(projects.horses.horsesApi)
-
-    // Infrastruktur-Clients
-    implementation(projects.infrastructure.cache.redisCache)
-    implementation(projects.infrastructure.messaging.messagingClient)
-    implementation(projects.infrastructure.monitoring.monitoringClient)
-
-    // KORREKTUR: Alle externen Abhängigkeiten werden jetzt über den Version Catalog bezogen.
 
     // Spring Boot Starters
     implementation(libs.spring.boot.starter.web)
@@ -42,11 +33,10 @@ dependencies {
     runtimeOnly(libs.postgresql.driver)
     testRuntimeOnly(libs.h2.driver)
 
-
     // Testing
     testImplementation(projects.platform.platformTesting)
     testImplementation(libs.spring.boot.starter.test)
-    testImplementation(libs.logback.classic)  // SLF4J provider for tests
+  testImplementation(libs.logback.classic)
 }
 
 tasks.test {