refactor: move NFO repair from initialization_service to folder_scan_service

Moves perform_nfo_repair_scan and its helpers (_repair_one_series,
_NFO_REPAIR_SEMAPHORE) into folder_scan_service.py so NFO repair runs
during the scheduled folder scan instead of on startup.

- Removes NFO repair code from initialization_service.py
- Updates all test imports and patch targets
- Updates docs/NFO_GUIDE.md and docs/CHANGELOG.md references

All 174 related tests pass.

tests/integration/test_nfo_repair_startup.py

@@ -67,7 +67,7 @@ class TestNfoRepairScanIntegrationWithBackgroundLoader:
     @pytest.mark.asyncio
     async def test_incomplete_nfo_series_scheduled_for_repair(self, tmp_path):
         """Series whose tvshow.nfo is missing required tags are scheduled via asyncio.create_task."""
-        from src.server.services.initialization_service import perform_nfo_repair_scan
+        from src.server.services.folder_scan_service import perform_nfo_repair_scan
 
         series_dir = tmp_path / "IncompleteAnime"
         series_dir.mkdir()
@@ -83,7 +83,7 @@ class TestNfoRepairScanIntegrationWithBackgroundLoader:
         mock_repair_service.repair_series = AsyncMock(return_value=True)
 
         with patch(
-            "src.server.services.initialization_service.settings", mock_settings
+            "src.server.services.folder_scan_service._settings", mock_settings
         ), patch(
             "src.core.services.nfo_repair_service.nfo_needs_repair",
             return_value=True,
@@ -103,7 +103,7 @@ class TestNfoRepairScanIntegrationWithBackgroundLoader:
     @pytest.mark.asyncio
     async def test_complete_nfo_series_not_scheduled(self, tmp_path):
         """Series whose tvshow.nfo has all required tags are not scheduled for repair."""
-        from src.server.services.initialization_service import perform_nfo_repair_scan
+        from src.server.services.folder_scan_service import perform_nfo_repair_scan
 
         series_dir = tmp_path / "CompleteAnime"
         series_dir.mkdir()
@@ -116,7 +116,7 @@ class TestNfoRepairScanIntegrationWithBackgroundLoader:
         mock_settings.anime_directory = str(tmp_path)
 
         with patch(
-            "src.server.services.initialization_service.settings", mock_settings
+            "src.server.services.folder_scan_service._settings", mock_settings
         ), patch(
             "src.core.services.nfo_repair_service.nfo_needs_repair",
             return_value=False,

tests/unit/test_folder_scan_service.py

@@ -20,6 +20,7 @@ from src.server.services.folder_scan_service import (
     _TMDB_SEMAPHORE,
     FolderScanService,
     FolderScanServiceError,
+    perform_nfo_repair_scan,
 )
 
 # ---------------------------------------------------------------------------

tests/unit/test_initialization_service.py

@@ -10,6 +10,7 @@ from unittest.mock import AsyncMock, MagicMock, call, patch
 
 import pytest
 
+from src.server.services.folder_scan_service import perform_nfo_repair_scan
 from src.server.services.initialization_service import (
     _check_initial_scan_status,
     _check_media_scan_status,
@@ -27,7 +28,6 @@ from src.server.services.initialization_service import (
     _validate_anime_directory,
     perform_initial_setup,
     perform_media_scan_if_needed,
-    perform_nfo_repair_scan,
     perform_nfo_scan_if_needed,
 )
 
@@ -771,7 +771,7 @@ class TestPerformNfoRepairScan:
         mock_settings.anime_directory = str(tmp_path)
 
         with patch(
-            "src.server.services.initialization_service.settings", mock_settings
+            "src.server.services.folder_scan_service._settings", mock_settings
         ):
             await perform_nfo_repair_scan()
 
@@ -785,7 +785,7 @@ class TestPerformNfoRepairScan:
         mock_settings.anime_directory = ""
 
         with patch(
-            "src.server.services.initialization_service.settings", mock_settings
+            "src.server.services.folder_scan_service._settings", mock_settings
         ):
             await perform_nfo_repair_scan()
 
@@ -805,7 +805,7 @@ class TestPerformNfoRepairScan:
         mock_repair_service.repair_series = AsyncMock(return_value=True)
 
         with patch(
-            "src.server.services.initialization_service.settings", mock_settings
+            "src.server.services.folder_scan_service._settings", mock_settings
         ), patch(
             "src.core.services.nfo_repair_service.nfo_needs_repair",
             return_value=True,
@@ -835,7 +835,7 @@ class TestPerformNfoRepairScan:
         mock_settings.anime_directory = str(tmp_path)
 
         with patch(
-            "src.server.services.initialization_service.settings", mock_settings
+            "src.server.services.folder_scan_service._settings", mock_settings
         ), patch(
             "src.core.services.nfo_repair_service.nfo_needs_repair",
             return_value=False,
@@ -865,7 +865,7 @@ class TestPerformNfoRepairScan:
         mock_repair_service.repair_series = AsyncMock(return_value=True)
 
         with patch(
-            "src.server.services.initialization_service.settings", mock_settings
+            "src.server.services.folder_scan_service._settings", mock_settings
         ), patch(
             "src.core.services.nfo_repair_service.nfo_needs_repair",
             return_value=True,