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_monitored_provider.py

@@ -5,8 +5,8 @@ from unittest.mock import MagicMock, patch
 
 import pytest
 
-from src.core.providers.base_provider import Loader
-from src.core.providers.monitored_provider import (
+from src.server.providers.base_provider import Loader
+from src.server.providers.monitored_provider import (
     MonitoredProviderWrapper,
     wrap_provider,
 )
@@ -84,7 +84,7 @@ def mock_health_monitor():
 def monitored_wrapper(mock_provider, mock_health_monitor):
     """Create a monitored wrapper with mock health monitor."""
     with patch(
-        "src.core.providers.monitored_provider.get_health_monitor",
+        "src.server.providers.monitored_provider.get_health_monitor",
         return_value=mock_health_monitor,
     ):
         wrapper = ConcreteMonitoredWrapper(
@@ -100,7 +100,7 @@ class TestMonitoredProviderWrapperInit:
     def test_wrapper_stores_provider(self, mock_provider):
         """Wrapper should store the wrapped provider."""
         with patch(
-            "src.core.providers.monitored_provider.get_health_monitor"
+            "src.server.providers.monitored_provider.get_health_monitor"
         ):
             wrapper = ConcreteMonitoredWrapper(mock_provider)
         assert wrapper._provider is mock_provider
@@ -108,7 +108,7 @@ class TestMonitoredProviderWrapperInit:
     def test_wrapper_monitoring_enabled_by_default(self, mock_provider):
         """Monitoring should be enabled by default."""
         with patch(
-            "src.core.providers.monitored_provider.get_health_monitor"
+            "src.server.providers.monitored_provider.get_health_monitor"
         ):
             wrapper = ConcreteMonitoredWrapper(mock_provider)
         assert wrapper._enable_monitoring is True
@@ -320,7 +320,7 @@ class TestWrapProviderFunction:
     def test_wrap_creates_monitored_wrapper(self, mock_provider):
         """wrap_provider should return MonitoredProviderWrapper."""
         with patch(
-            "src.core.providers.monitored_provider.get_health_monitor"
+            "src.server.providers.monitored_provider.get_health_monitor"
         ):
             # wrap_provider returns MonitoredProviderWrapper which can't be
             # instantiated directly due to missing abstract methods.