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

platform/platform-testing/build.gradle.kts

@@ -0,0 +1,35 @@
+plugins {
+    `java-library`
+    kotlin("jvm")
+}
+
+dependencies {
+    api(platform(projects.platform.platformBom))
+
+    // Kotlin Test
+    api("org.jetbrains.kotlin:kotlin-test")
+    api("org.jetbrains.kotlin:kotlin-test-junit")
+
+    // JUnit
+    api("org.junit.jupiter:junit-jupiter-api")
+    api("org.junit.jupiter:junit-jupiter-engine")
+    api("org.junit.jupiter:junit-jupiter-params")
+
+    // Mocking and Assertions
+    api("io.mockk:mockk:1.13.8")
+    api("org.assertj:assertj-core:3.24.2")
+
+    // Coroutines Testing
+    api("org.jetbrains.kotlinx:kotlinx-coroutines-test")
+
+    // Spring Boot Testing
+    api("org.springframework.boot:spring-boot-starter-test")
+
+    // Database Testing
+    api("com.h2database:h2")
+
+    // Test Containers
+    api("org.testcontainers:testcontainers:1.19.5")
+    api("org.testcontainers:junit-jupiter:1.19.5")
+    api("org.testcontainers:postgresql:1.19.5")
+}