feat: Implement merge person functionality with associated request and repository methods

libertas_core/src/repositories.rs

@@ -99,6 +99,7 @@ pub trait FaceRegionRepository: Send + Sync {
     async fn find_by_id(&self, face_region_id: Uuid) -> CoreResult<Option<FaceRegion>>;
     async fn update_person_id(&self, face_region_id: Uuid, person_id: Uuid) -> CoreResult<()>;
     async fn delete(&self, face_region_id: Uuid) -> CoreResult<()>;
+    async fn reassign_person(&self, old_person_id: Uuid, new_person_id: Uuid) -> CoreResult<()>;
 }
 
 #[async_trait]

libertas_core/src/services.rs

@@ -106,6 +106,13 @@ pub trait PersonService: Send + Sync {
         target_user_id: Uuid,
         owner_id: Uuid,
     ) -> CoreResult<()>;
+
+    async fn merge_people(
+        &self,
+        target_person_id: Uuid,
+        source_person_id: Uuid,
+        user_id: Uuid,
+    ) -> CoreResult<()>;
 }
 
 #[async_trait]