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-bom/build.gradle.kts

@@ -0,0 +1,45 @@
+plugins {
+    `java-platform`
+    `maven-publish`
+}
+
+javaPlatform {
+    allowDependencies()
+}
+
+dependencies {
+    api(platform("org.springframework.boot:spring-boot-dependencies:3.2.0"))
+    api(platform("org.jetbrains.kotlin:kotlin-bom:2.1.20"))
+    api(platform("org.jetbrains.kotlinx:kotlinx-coroutines-bom:1.10.1"))
+
+    constraints {
+        api("com.github.ben-manes.caffeine:caffeine:3.1.8")
+        api("io.projectreactor.kafka:reactor-kafka:1.3.22")
+        api("org.springdoc:springdoc-openapi-starter-webmvc-ui:2.3.0")
+        api("org.springdoc:springdoc-openapi-starter-webflux-ui:2.3.0")
+        api("org.springdoc:springdoc-openapi-starter-common:2.3.0")
+        api("org.redisson:redisson:3.27.1")
+        api("io.lettuce:lettuce-core:6.3.1.RELEASE")
+        api("io.github.microutils:kotlin-logging-jvm:3.0.5")
+        api("org.jetbrains.exposed:exposed-core:0.52.0")
+        api("org.jetbrains.exposed:exposed-dao:0.52.0")
+        api("org.jetbrains.exposed:exposed-jdbc:0.52.0")
+        api("org.jetbrains.exposed:exposed-kotlin-datetime:0.52.0")
+        api("org.postgresql:postgresql:42.7.3")
+        api("com.zaxxer:HikariCP:5.1.0")
+        api("com.h2database:h2:2.2.224")
+        api("org.jetbrains.kotlinx:kotlinx-serialization-json:1.8.1")
+        api("org.jetbrains.kotlinx:kotlinx-datetime:0.6.1")
+        api("com.benasher44:uuid:0.8.2")
+        api("com.ionspin.kotlin:bignum:0.3.8")
+        api("com.orbitz.consul:consul-client:1.5.3")
+    }
+}
+
+publishing {
+    publications {
+        create<MavenPublication>("maven") {
+            from(components["javaPlatform"])
+        }
+    }
+}