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/utils/test_credit_decorators.py

@@ -28,7 +28,8 @@ class TestRequiresCreditsDecorator:
 
     @pytest.fixture
     def credit_service_factory(
-        self, mock_credit_service: AsyncMock,
+        self,
+        mock_credit_service: AsyncMock,
     ) -> Callable[[], AsyncMock]:
         """Create a credit service factory."""
         return lambda: mock_credit_service
@@ -98,7 +99,9 @@ class TestRequiresCreditsDecorator:
 
     @pytest.mark.asyncio
     async def test_decorator_failed_action(
-        self, credit_service_factory, mock_credit_service,
+        self,
+        credit_service_factory,
+        mock_credit_service,
     ) -> None:
         """Test decorator with failed action."""
 
@@ -122,7 +125,9 @@ class TestRequiresCreditsDecorator:
 
     @pytest.mark.asyncio
     async def test_decorator_exception_in_action(
-        self, credit_service_factory, mock_credit_service,
+        self,
+        credit_service_factory,
+        mock_credit_service,
     ) -> None:
         """Test decorator when action raises exception."""
 
@@ -147,7 +152,9 @@ class TestRequiresCreditsDecorator:
 
     @pytest.mark.asyncio
     async def test_decorator_insufficient_credits(
-        self, credit_service_factory, mock_credit_service,
+        self,
+        credit_service_factory,
+        mock_credit_service,
     ) -> None:
         """Test decorator with insufficient credits."""
         mock_credit_service.validate_and_reserve_credits.side_effect = (
@@ -170,7 +177,9 @@ class TestRequiresCreditsDecorator:
 
     @pytest.mark.asyncio
     async def test_decorator_user_id_in_args(
-        self, credit_service_factory, mock_credit_service,
+        self,
+        credit_service_factory,
+        mock_credit_service,
     ) -> None:
         """Test decorator extracting user_id from positional args."""
 
@@ -218,14 +227,17 @@ class TestValidateCreditsOnlyDecorator:
 
     @pytest.fixture
     def credit_service_factory(
-        self, mock_credit_service: AsyncMock,
+        self,
+        mock_credit_service: AsyncMock,
     ) -> Callable[[], AsyncMock]:
         """Create a credit service factory."""
         return lambda: mock_credit_service
 
     @pytest.mark.asyncio
     async def test_validate_only_decorator(
-        self, credit_service_factory, mock_credit_service,
+        self,
+        credit_service_factory,
+        mock_credit_service,
     ) -> None:
         """Test validate_credits_only decorator."""