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_anime_list_loading.py

@@ -7,12 +7,26 @@ from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
 
-from src.core.entities.series import Serie
-from src.core.SeriesApp import SeriesApp
+from src.server.SeriesApp import SeriesApp
 from src.server.database.models import AnimeSeries, Episode
 from src.server.services.anime_service import AnimeService
 
 
+def make_anime(key, name, site, folder, episodeDict=None, year=None):
+    """Create a mock AnimeSeries with episodeDict cache set."""
+    if episodeDict is None:
+        episodeDict = {}
+    mock = MagicMock(spec=AnimeSeries)
+    mock.key = key
+    mock.name = name
+    mock.site = site
+    mock.folder = folder
+    mock.year = year
+    mock.episodeDict = episodeDict
+    mock._episode_dict_cache = episodeDict
+    return mock
+
+
 class TestAnimeListLoading:
     """Test suite for anime list loading functionality."""
 
@@ -98,8 +112,8 @@ class TestAnimeListLoading:
             called_series = mock_series_app.load_series_from_list.call_args[0][0]
             assert len(called_series) == 2
             
-            # Verify Serie objects have correct attributes
-            assert all(isinstance(s, Serie) for s in called_series)
+            # Verify AnimeSeries objects have correct attributes
+            assert all(isinstance(s, AnimeSeries) for s in called_series)
             assert called_series[0].key == "test-anime-1"
             assert called_series[0].name == "Test Anime 1"
             assert called_series[0].folder == "Test Anime 1 (2023)"
@@ -140,14 +154,14 @@ class TestAnimeListLoading:
         
         # Create test series
         test_series = [
-            Serie(
+            make_anime(
                 key="test-1",
                 name="Test Series 1",
                 site="aniworld.to",
                 folder="Test Series 1 (2023)",
                 episodeDict={1: [1, 2, 3]}
             ),
-            Serie(
+            make_anime(
                 key="test-2",
                 name="Test Series 2",
                 site="aniworld.to",
@@ -295,7 +309,7 @@ class TestAnimeListLoading:
             "With skip_load=True, list should be empty initially"
         
         # Test that manual loading works
-        test_serie = Serie(
+        test_serie = make_anime(
             key="test",
             name="Test",
             site="aniworld.to",