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

libertas_api/src/schema.rs

@@ -239,3 +239,8 @@ pub struct PublicAlbumBundleResponse {
     pub album: AlbumResponse,
     pub media: Vec<MediaResponse>,
 }
+
+#[derive(Deserialize)]
+pub struct MergePersonRequest {
+    pub source_person_id: Uuid,
+}