Refactor sound and extraction services to include user and timestamp fields

- Updated ExtractionInfo to include user_id, created_at, and updated_at fields.
- Modified ExtractionService to return user and timestamp information in extraction responses.
- Enhanced sound serialization in PlayerState to include extraction URL if available.
- Adjusted PlaylistRepository to load sound extractions when retrieving playlist sounds.
- Added tests for new fields in extraction and sound endpoints, ensuring proper response structure.
- Created new test file endpoints for sound downloads and thumbnail retrievals, including success and error cases.
- Refactored various test cases for consistency and clarity, ensuring proper mocking and assertions.

tests/api/v1/test_sound_endpoints.py

@@ -31,6 +31,9 @@ class TestSoundEndpoints:
             "status": "pending",
             "error": None,
             "sound_id": None,
+            "user_id": authenticated_user.id,
+            "created_at": "2025-08-03T12:00:00Z",
+            "updated_at": "2025-08-03T12:00:00Z",
         }
 
         with (
@@ -107,6 +110,9 @@ class TestSoundEndpoints:
             "status": "completed",
             "error": None,
             "sound_id": 42,
+            "user_id": authenticated_user.id,
+            "created_at": "2025-08-03T12:00:00Z",
+            "updated_at": "2025-08-03T12:00:00Z",
         }
 
         with patch(
@@ -158,6 +164,9 @@ class TestSoundEndpoints:
                 "status": "completed",
                 "error": None,
                 "sound_id": 42,
+                "user_id": authenticated_user.id,
+                "created_at": "2025-08-03T12:00:00Z",
+                "updated_at": "2025-08-03T12:00:00Z",
             },
             {
                 "id": 2,
@@ -168,6 +177,9 @@ class TestSoundEndpoints:
                 "status": "pending",
                 "error": None,
                 "sound_id": None,
+                "user_id": authenticated_user.id,
+                "created_at": "2025-08-03T12:00:00Z",
+                "updated_at": "2025-08-03T12:00:00Z",
             },
         ]