Refactor BundeslandRepository, implement V012 migration for Reiter master data changes, harmonize domain models, resolve repository interface inconsistencies, and enhance ZNS import with relational mapping improvements.

backend/services/masterdata/masterdata-domain/src/commonMain/kotlin/at/mocode/masterdata/domain/repository/BundeslandRepository.kt

@@ -1,6 +1,7 @@
 @file:OptIn(kotlin.uuid.ExperimentalUuidApi::class)
 package at.mocode.masterdata.domain.repository
 
+import at.mocode.masterdata.domain.model.Bundesland
 import at.mocode.masterdata.domain.model.BundeslandDefinition
 import kotlin.uuid.Uuid
 
@@ -12,7 +13,7 @@ interface BundeslandRepository {
     /**
      * ZNS-Spezifisch: Sucht ein Bundesland anhand seiner Nummer (01-09).
      */
-    suspend fun findByNr(nr: Int): at.mocode.masterdata.domain.model.BundeslandDefinition?
+    suspend fun findByNr(nr: Int): BundeslandDefinition?
 
     /**
      * Finds a federal state by its unique ID.