feat: NCS-52 Rules as a microservice (#36)

Implemented module rules as a microservice.
## Summary

   - Adds Quarkus to the `rule` module, making it independently deployable as a standalone microservice on port 8081
   - Exposes all `RuleSet` methods via a REST API at `/api/rules` (candidate moves, legal moves, check/checkmate/stalemate/draw detection, apply
   move)
   - Introduces DTOs and a `DtoMapper` for serializing/deserializing chess types (board, moves, game context) as flat JSON strings
   - Adds `JacksonConfig` for Scala module registration and an `application.yml` for the rule service
   - Includes Dockerfiles for JVM, legacy-jar, native, and native-micro targets
   - Full test coverage: 17 `@QuarkusTest` HTTP-level tests + 29 `DtoMapper` unit tests (100% condition coverage)

   ## Test plan

   - [ ] `./compile` — all modules build successfully
   - [ ] `./test` — all tests pass (rule module: 107 tests total)
   - [ ] `./coverage` — 100% condition coverage in `rule` module
   - [ ] Rule service runs standalone: `./gradlew :modules:rule:quarkusDev` starts on port 8081
   - [ ] `GET /api/rules/candidate-moves` returns valid moves for initial position
   - [ ] `GET /api/rules/is-check` returns `false` for initial position

Co-authored-by: LQ63 <lkhermann@web.de>
Co-authored-by: Janis <janis-e@gmx.de>
Reviewed-on: #36
Co-authored-by: Leon Hermann <lq@blackhole.local>
Co-committed-by: Leon Hermann <lq@blackhole.local>

modules/core/build.gradle.kts

@@ -48,7 +48,6 @@ dependencies {
     }
 
     implementation(project(":modules:api"))
-    implementation(project(":modules:rule"))
     implementation(project(":modules:bot"))
 
 
@@ -69,6 +68,7 @@ dependencies {
 
 
     testImplementation(project(":modules:io"))
+    testImplementation(project(":modules:rule"))
 
     testImplementation(platform("org.junit:junit-bom:5.13.4"))
     testImplementation("org.junit.jupiter:junit-jupiter")