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/integration/test_provider_failover_scenarios.py

@@ -5,12 +5,12 @@ from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
 
-from src.core.providers.failover import (
+from src.server.providers.failover import (
     ProviderFailover,
     configure_failover,
     get_failover,
 )
-from src.core.providers.health_monitor import ProviderHealthMonitor
+from src.server.providers.health_monitor import ProviderHealthMonitor
 
 
 class TestProviderFailoverScenarios:
@@ -132,7 +132,7 @@ class TestProviderFailoverScenarios:
         assert "provider1" not in monitor.get_available_providers()
 
         with patch(
-            "src.core.providers.failover.get_health_monitor",
+            "src.server.providers.failover.get_health_monitor",
             return_value=monitor,
         ):
             failover = ProviderFailover(
@@ -236,7 +236,7 @@ class TestFailoverStats:
         monitor.record_request("p2", False, 200, error_message="fail")
 
         with patch(
-            "src.core.providers.failover.get_health_monitor",
+            "src.server.providers.failover.get_health_monitor",
             return_value=monitor,
         ):
             failover = ProviderFailover(
@@ -253,7 +253,7 @@ class TestConfigureFailover:
 
     def test_configure_failover(self):
         """configure_failover should create a new global instance."""
-        import src.core.providers.failover as fo
+        import src.server.providers.failover as fo
         fo._failover = None
 
         failover = configure_failover(
@@ -271,7 +271,7 @@ class TestConfigureFailover:
 
     def test_get_failover_singleton(self):
         """get_failover should return same instance."""
-        import src.core.providers.failover as fo
+        import src.server.providers.failover as fo
         fo._failover = None
 
         first = get_failover()