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

infrastructure/auth/auth-server/build.gradle.kts

@@ -0,0 +1,23 @@
+plugins {
+    kotlin("jvm")
+    kotlin("plugin.spring")
+    id("org.springframework.boot")
+}
+
+// Configure main class for bootJar task
+springBoot {
+    mainClass.set("at.mocode.infrastructure.auth.AuthServerApplicationKt")
+}
+
+dependencies {
+    implementation(projects.platform.platformDependencies)
+    implementation(projects.infrastructure.auth.authClient)
+
+    implementation("org.springframework.boot:spring-boot-starter-web")
+    implementation("org.springframework.boot:spring-boot-starter-security")
+    implementation("org.springframework.boot:spring-boot-starter-oauth2-resource-server")
+    implementation("org.springframework.boot:spring-boot-starter-actuator")
+    implementation("org.keycloak:keycloak-admin-client:23.0.0")
+
+    testImplementation(projects.platform.platformTesting)
+}

infrastructure/auth/auth-server/src/main/kotlin/at/mocode/infrastructure/auth/AuthServerApplication.kt

@@ -0,0 +1,11 @@
+package at.mocode.infrastructure.auth
+
+import org.springframework.boot.autoconfigure.SpringBootApplication
+import org.springframework.boot.runApplication
+
+@SpringBootApplication
+class AuthServerApplication
+
+fun main(args: Array<String>) {
+    runApplication<AuthServerApplication>(*args)
+}