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/rule/build.gradle.kts

@@ -1,6 +1,7 @@
 plugins {
     id("scala")
     id("org.scoverage") version "8.1"
+    id("io.quarkus")
 }
 
 group = "de.nowchess"
@@ -25,6 +26,10 @@ tasks.withType<ScalaCompile> {
     scalaCompileOptions.additionalParameters = listOf("-encoding", "UTF-8")
 }
 
+val quarkusPlatformGroupId: String by project
+val quarkusPlatformArtifactId: String by project
+val quarkusPlatformVersion: String by project
+
 dependencies {
 
     compileOnly("org.scala-lang:scala3-compiler_3") {
@@ -40,20 +45,56 @@ dependencies {
 
     implementation(project(":modules:api"))
 
+    implementation(platform("${quarkusPlatformGroupId}:${quarkusPlatformArtifactId}:${quarkusPlatformVersion}"))
+    implementation("io.quarkus:quarkus-rest")
+    implementation("io.quarkus:quarkus-hibernate-orm")
+    implementation("io.quarkus:quarkus-rest-client-jackson")
+    implementation("io.quarkus:quarkus-rest-client")
+    implementation("io.quarkus:quarkus-rest-jackson")
+    implementation("io.quarkus:quarkus-config-yaml")
+    implementation("io.quarkus:quarkus-smallrye-fault-tolerance")
+    implementation("io.quarkus:quarkus-smallrye-jwt")
+    implementation("io.quarkus:quarkus-smallrye-health")
+    implementation("io.quarkus:quarkus-micrometer")
+    implementation("io.quarkus:quarkus-arc")
+    implementation("com.fasterxml.jackson.module:jackson-module-scala_3:${versions["JACKSON_SCALA"]!!}")
+
     testImplementation(project(":modules:io"))
     testImplementation(platform("org.junit:junit-bom:5.13.4"))
     testImplementation("org.junit.jupiter:junit-jupiter")
     testImplementation("org.scalatest:scalatest_3:${versions["SCALATEST"]!!}")
     testImplementation("co.helmethair:scalatest-junit-runner:${versions["SCALATEST_JUNIT"]!!}")
+    testImplementation("io.quarkus:quarkus-junit5")
+    testImplementation("io.rest-assured:rest-assured")
 
     testRuntimeOnly("org.junit.platform:junit-platform-launcher")
 }
 
+configurations.matching { !it.name.startsWith("scoverage") }.configureEach {
+    resolutionStrategy.force("org.scala-lang:scala-library:${versions["SCALA_LIBRARY"]!!}")
+}
+configurations.scoverage {
+    resolutionStrategy.eachDependency {
+        if (requested.group == "org.scoverage" && requested.name.startsWith("scalac-scoverage-plugin_")) {
+            useTarget("${requested.group}:scalac-scoverage-plugin_2.13.16:2.3.0")
+        }
+    }
+}
+
+tasks.withType<JavaCompile> {
+    options.encoding = "UTF-8"
+    options.compilerArgs.add("-parameters")
+}
+
+tasks.withType<Jar>().configureEach {
+    duplicatesStrategy = DuplicatesStrategy.EXCLUDE
+}
+
 tasks.test {
     useJUnitPlatform {
-        includeEngines("scalatest")
+        includeEngines("scalatest", "junit-jupiter")
         testLogging {
-            events("skipped", "failed")
+            events("passed", "skipped", "failed")
         }
     }
     finalizedBy(tasks.reportScoverage)
@@ -61,3 +102,7 @@ tasks.test {
 tasks.reportScoverage {
     dependsOn(tasks.test)
 }
+
+tasks.jar {
+    duplicatesStrategy = DuplicatesStrategy.EXCLUDE
+}