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-api/build.gradle.kts

@@ -32,6 +32,7 @@ kotlin {
     commonMain {
       dependencies {
         implementation(libs.kotlinx.serialization.json)
+        implementation(projects.core.coreDomain)
       }
     }
     commonTest {

backend/services/entries/entries-api/src/commonMain/kotlin/at/mocode/entries/api/NennungDtos.kt

@@ -0,0 +1,134 @@
+@file:OptIn(kotlin.uuid.ExperimentalUuidApi::class)
+
+package at.mocode.entries.api
+
+import at.mocode.core.domain.model.NennungsStatusE
+import at.mocode.core.domain.model.StartwunschE
+import at.mocode.core.domain.serialization.UuidSerializer
+import kotlinx.serialization.Serializable
+import kotlin.uuid.Uuid
+
+/**
+ * Vollständige Nennungs-Details (für GET /{id}, POST, PUT, DELETE Responses).
+ */
+@Serializable
+data class NennungDetailDto(
+  @Serializable(with = UuidSerializer::class)
+  val nennungId: Uuid,
+  @Serializable(with = UuidSerializer::class)
+  val abteilungId: Uuid,
+  @Serializable(with = UuidSerializer::class)
+  val bewerbId: Uuid,
+  @Serializable(with = UuidSerializer::class)
+  val turnierId: Uuid,
+  @Serializable(with = UuidSerializer::class)
+  val reiterId: Uuid,
+  @Serializable(with = UuidSerializer::class)
+  val pferdId: Uuid,
+  @Serializable(with = UuidSerializer::class)
+  val zahlerId: Uuid? = null,
+  val status: NennungsStatusE,
+  val startwunsch: StartwunschE,
+  val istNachnennung: Boolean,
+  val nachnenngebuehrErlassen: Boolean,
+  val isNachnenngebuehrFaellig: Boolean,
+  val bemerkungen: String? = null,
+  val createdAt: String,
+  val updatedAt: String
+)
+
+/**
+ * Kompakte Nennungs-Übersicht (für Listen-Endpunkte).
+ */
+@Serializable
+data class NennungSummaryDto(
+  @Serializable(with = UuidSerializer::class)
+  val nennungId: Uuid,
+  @Serializable(with = UuidSerializer::class)
+  val turnierId: Uuid,
+  @Serializable(with = UuidSerializer::class)
+  val bewerbId: Uuid,
+  @Serializable(with = UuidSerializer::class)
+  val abteilungId: Uuid,
+  @Serializable(with = UuidSerializer::class)
+  val reiterId: Uuid,
+  @Serializable(with = UuidSerializer::class)
+  val pferdId: Uuid,
+  val status: NennungsStatusE,
+  val istNachnennung: Boolean,
+  val createdAt: String
+)
+
+/**
+ * Request zum Einreichen einer neuen Nennung (POST /).
+ */
+@Serializable
+data class NennungEinreichenRequest(
+  @Serializable(with = UuidSerializer::class)
+  val abteilungId: Uuid,
+  @Serializable(with = UuidSerializer::class)
+  val bewerbId: Uuid,
+  @Serializable(with = UuidSerializer::class)
+  val turnierId: Uuid,
+  @Serializable(with = UuidSerializer::class)
+  val reiterId: Uuid,
+  @Serializable(with = UuidSerializer::class)
+  val pferdId: Uuid,
+  @Serializable(with = UuidSerializer::class)
+  val zahlerId: Uuid? = null,
+  val startwunsch: StartwunschE = StartwunschE.KEIN_WUNSCH,
+  val istNachnennung: Boolean = false,
+  val bemerkungen: String? = null
+)
+
+/**
+ * Request zum Ändern des Nennungs-Status (PUT /{id}/status).
+ */
+@Serializable
+data class NennungStatusAendernRequest(
+  val neuerStatus: NennungsStatusE,
+  val bemerkungen: String? = null
+)
+
+/**
+ * Request für einen Nennungs-Transfer (POST /{id}/transfer).
+ */
+@Serializable
+data class NennungTransferRequest(
+  @Serializable(with = UuidSerializer::class)
+  val neuerReiterId: Uuid? = null,
+  @Serializable(with = UuidSerializer::class)
+  val neuesPferdId: Uuid? = null,
+  val istNachNennschluss: Boolean = false,
+  val nachnenngebuehrErlassen: Boolean = false,
+  @Serializable(with = UuidSerializer::class)
+  val autorisiertVon: Uuid,
+  val grund: String? = null
+)
+
+/**
+ * Response für einen abgeschlossenen Nennungs-Transfer.
+ */
+@Serializable
+data class NennungsTransferDto(
+  @Serializable(with = UuidSerializer::class)
+  val transferId: Uuid,
+  @Serializable(with = UuidSerializer::class)
+  val ursprungsNennungId: Uuid,
+  @Serializable(with = UuidSerializer::class)
+  val neueNennungId: Uuid,
+  @Serializable(with = UuidSerializer::class)
+  val alterReiterId: Uuid? = null,
+  @Serializable(with = UuidSerializer::class)
+  val neuerReiterId: Uuid? = null,
+  @Serializable(with = UuidSerializer::class)
+  val altesPferdId: Uuid? = null,
+  @Serializable(with = UuidSerializer::class)
+  val neuesPferdId: Uuid? = null,
+  val istNachNennschluss: Boolean,
+  val nachnenngebuehrErlassen: Boolean,
+  @Serializable(with = UuidSerializer::class)
+  val autorisiertVon: Uuid,
+  val grund: String? = null,
+  val createdAt: String
+)