feat: Implement face clustering and media retrieval for persons

libertas_infra/src/repositories/face_embedding_repository.rs

@@ -58,4 +58,23 @@ impl FaceEmbeddingRepository for PostgresFaceEmbeddingRepository {
 
         Ok(pg_embedding.map(FaceEmbedding::from))
     }
+
+    async fn list_unassigned_by_user(&self, user_id: Uuid) -> CoreResult<Vec<FaceEmbedding>> {
+        let pg_embeddings = sqlx::query_as!(
+            PostgresFaceEmbedding,
+            r#"
+            SELECT fe.id, fe.face_region_id, fe.model_id, fe.embedding
+            FROM face_embeddings fe
+            JOIN face_regions fr ON fe.face_region_id = fr.id
+            JOIN media m ON fr.media_id = m.id
+            WHERE fr.person_id IS NULL AND m.owner_id = $1
+            "#,
+            user_id
+        )
+        .fetch_all(&self.pool)
+        .await
+        .map_err(|e| CoreError::Database(e.to_string()))?;
+
+        Ok(pg_embeddings.into_iter().map(FaceEmbedding::from).collect())
+    }
 }