feat: integrate new desktop shell and extend backend & ADRs

- Added `meldestelle-desktop` module using JVM/Compose Desktop, registered in `settings.gradle.kts`.
- Integrated new screens and desktop navigation into core: `Veranstaltungen`, `TurnierDetail`, etc.
- Expanded backend with `ExposedFunktionaerRepository` in `officials-infrastructure`.
- Completed ADRs for bounded context mapping (`ADR-0014`) and context map (`ADR-0015`).
- Updated and extended project documentation with session logs and architecture decisions.

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

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

@@ -0,0 +1,24 @@
+plugins {
+  alias(libs.plugins.kotlinMultiplatform)
+  alias(libs.plugins.kotlinSerialization)
+}
+kotlin {
+  jvm()
+  sourceSets {
+    commonMain {
+      kotlin.srcDir("src/main/kotlin")
+      dependencies {
+        implementation(projects.core.coreDomain)
+        implementation(projects.core.coreUtils)
+        implementation(libs.kotlinx.datetime)
+        implementation(libs.kotlinx.serialization.json)
+      }
+    }
+    commonTest {
+      kotlin.srcDir("src/test/kotlin")
+      dependencies {
+        implementation(projects.platform.platformTesting)
+      }
+    }
+  }
+}