refactor: Migrate from monolithic to modular architecture

- Restructure project into domain-specific modules (core, masterdata, members, horses, events, infrastructure)
- Create shared client components in common-ui module
- Implement CI/CD workflows with GitHub Actions
- Consolidate documentation in docs directory
- Remove deprecated modules and documentation files
- Add cleanup and migration scripts for transition
- Update README with new project structure and setup instructions

masterdata/masterdata-service/build.gradle.kts

@@ -0,0 +1,32 @@
+plugins {
+    kotlin("jvm")
+    kotlin("plugin.spring")
+    id("org.springframework.boot")
+}
+
+springBoot {
+    mainClass.set("at.mocode.masterdata.service.MasterdataServiceApplicationKt")
+}
+
+dependencies {
+    implementation(projects.platform.platformDependencies)
+
+    implementation(projects.masterdata.masterdataDomain)
+    implementation(projects.masterdata.masterdataApplication)
+    implementation(projects.masterdata.masterdataInfrastructure)
+    implementation(projects.masterdata.masterdataApi)
+
+    implementation(projects.infrastructure.auth.authClient)
+    implementation(projects.infrastructure.cache.redisCache)
+    implementation(projects.infrastructure.messaging.messagingClient)
+    implementation(projects.infrastructure.monitoring.monitoringClient)
+
+    implementation("org.springframework.boot:spring-boot-starter-web")
+    implementation("org.springframework.boot:spring-boot-starter-validation")
+    implementation("org.springframework.boot:spring-boot-starter-actuator")
+    implementation("org.springdoc:springdoc-openapi-starter-webmvc-ui")
+
+    runtimeOnly("org.postgresql:postgresql")
+
+    testImplementation(projects.platform.platformTesting)
+}

masterdata/masterdata-service/src/main/kotlin/at/mocode/masterdata/service/MasterdataServiceApplication.kt

@@ -0,0 +1,19 @@
+package at.mocode.masterdata.service
+
+import org.springframework.boot.autoconfigure.SpringBootApplication
+import org.springframework.boot.runApplication
+
+/**
+ * Main application class for the Masterdata Service.
+ *
+ * This service provides APIs for managing master data such as countries, regions, and other reference data.
+ */
+@SpringBootApplication
+class MasterdataServiceApplication
+
+/**
+ * Main entry point for the Masterdata Service application.
+ */
+fun main(args: Array<String>) {
+    runApplication<MasterdataServiceApplication>(*args)
+}