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-infrastructure/build.gradle.kts

@@ -1,27 +1,26 @@
 plugins {
-    alias(libs.plugins.kotlin.jvm)
-    alias(libs.plugins.kotlin.spring)
-
-    // KORREKTUR: Dieses Plugin ist entscheidend. Es schaltet den `springBoot`-Block
-    // und alle Spring-Boot-spezifischen Gradle-Tasks frei.
-    alias(libs.plugins.spring.boot)
-
-    // Dependency Management für konsistente Spring-Versionen
+  kotlin("jvm")
+  alias(libs.plugins.spring.boot) apply false
     alias(libs.plugins.spring.dependencyManagement)
+  alias(libs.plugins.kotlinSpring)
 }
 
 dependencies {
     implementation(projects.platform.platformDependencies)
 
-    implementation(projects.masterdata.masterdataDomain)
-    implementation(projects.masterdata.masterdataApplication)
+  implementation(projects.backend.services.masterdata.masterdataDomain)
     implementation(projects.core.coreDomain)
     implementation(projects.core.coreUtils)
-    implementation(projects.infrastructure.cache.cacheApi)
-    implementation(projects.infrastructure.eventStore.eventStoreApi)
-    implementation(projects.infrastructure.messaging.messagingClient)
+  implementation(projects.backend.infrastructure.cache.cacheApi)
+  implementation(projects.backend.infrastructure.eventStore.eventStoreApi)
+  implementation(projects.backend.infrastructure.messaging.messagingClient)
+
+  // Exposed
+  implementation(libs.exposed.core)
+  implementation(libs.exposed.dao)
+  implementation(libs.exposed.jdbc)
+  implementation(libs.exposed.kotlin.datetime)
 
-    implementation("org.springframework.boot:spring-boot-starter-data-jpa")
     implementation("org.postgresql:postgresql")
 
     testImplementation(projects.platform.platformTesting)