refactor: restructure core→server, split large entity files into database module

- Move src/core/ → src/server/
- Split SerieList.py (531 lines) and series.py (414 lines) into src/server/database/
- Add database/models.py for SQLAlchemy models
- Update all test imports to reflect new structure
- Remove deprecated test files (test_serie_class.py, test_serie_folder_with_year.py)

tests/unit/test_serie_scanner_db_writes.py

@@ -4,8 +4,8 @@ from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
 
-from src.core.entities.series import Serie
-from src.core.SerieScanner import SerieScanner
+from src.server.database.models import AnimeSeries
+from src.server.SerieScanner import SerieScanner
 
 
 @pytest.fixture
@@ -18,15 +18,15 @@ def mock_session_factory():
 
 @pytest.fixture
 def sample_serie():
-    """Create a sample Serie for testing."""
-    return Serie(
-        key="attack-on-titan",
-        name="Attack on Titan",
-        site="aniworld.to",
-        folder="Attack on Titan (2013)",
-        episodeDict={1: [1, 2, 3], 2: [1, 2]},
-        year=2013
-    )
+    """Create a sample AnimeSeries mock for testing."""
+    anime = MagicMock(spec=AnimeSeries)
+    anime.key = "attack-on-titan"
+    anime.name = "Attack on Titan"
+    anime.site = "aniworld.to"
+    anime.folder = "Attack on Titan (2013)"
+    anime.year = 2013
+    anime.episodeDict = {1: [1, 2, 3], 2: [1, 2]}
+    return anime
 
 
 class TestPersistSerieToDb: