chore: remove deprecated horses, clubs, officials, and persons services

- Deleted obsolete modules related to horses, clubs, officials, and persons services, including their configurations, build files, and database provisioning scripts.
- Cleaned up associated references in the project structure (e.g., `settings.gradle.kts`).
- Removed unused database tables and Spring beans related to these domains.

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

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

@@ -1,11 +1,7 @@
 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
-    alias(libs.plugins.spring.dependencyManagement)
+  alias(libs.plugins.kotlinJvm)
+  alias(libs.plugins.kotlinSerialization)
+  id("application")
 }
 
 application {
@@ -16,8 +12,8 @@ dependencies {
     api(platform(libs.spring.boot.dependencies))
     // Interne Module
     implementation(projects.platform.platformDependencies)
-    implementation(projects.masterdata.masterdataDomain)
-    implementation(projects.masterdata.masterdataApplication)
+  implementation(projects.backend.services.masterdata.masterdataDomain)
+  implementation(projects.backend.services.masterdata.masterdataCommon)
     implementation(projects.core.coreDomain)
     implementation(projects.core.coreUtils)