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-dependencies/build.gradle.kts

@@ -0,0 +1,16 @@
+plugins {
+    `java-library`
+    kotlin("jvm")
+}
+
+dependencies {
+    api(platform(projects.platform.platformBom))
+
+    api("org.jetbrains.kotlin:kotlin-stdlib")
+    api("org.jetbrains.kotlin:kotlin-reflect")
+    api("org.jetbrains.kotlinx:kotlinx-coroutines-core")
+    api("org.jetbrains.kotlinx:kotlinx-coroutines-reactor")
+    api("io.github.microutils:kotlin-logging-jvm")
+    api("org.jetbrains.kotlinx:kotlinx-serialization-json")
+    api("org.jetbrains.kotlinx:kotlinx-datetime")
+}