feat(entries-domain): implement competition services, repository, and validations for ÖTO compliance

- Added `CompetitionRepository` with domain operations for Bewerb and Abteilung.
- Implemented `AbteilungsRegelService` for ÖTO § 39 rules and structural validations.
- Introduced `CompetitionWarningService` to handle threshold warnings for starters and structural requirements.
- Created test suites (`AbteilungsRegelServiceTest`, `DomBewerbTest`) to verify compliance and validations.
- Updated dependencies and build configuration for repository integration.

Signed-off-by: Stefan Mogeritsch <stefan.mo.co@gmail.com>

backend/services/entries/entries-domain/build.gradle.kts

@@ -10,6 +10,7 @@ kotlin {
       dependencies {
         implementation(projects.core.coreDomain)
         implementation(projects.core.coreUtils)
+        implementation(projects.backend.services.masterdata.masterdataDomain)
         implementation(libs.kotlinx.datetime)
         implementation(libs.kotlinx.serialization.json)
       }
@@ -17,6 +18,7 @@ kotlin {
     commonTest {
       kotlin.srcDir("src/test/kotlin")
       dependencies {
+        implementation(kotlin("test"))
         implementation(projects.platform.platformTesting)
       }
     }