feat(setup): track unresolved folders for manual key resolution

When SetupService cannot auto-resolve a provider key for an anime folder,
the folder is now tracked in the new 'unresolved_folders' table instead of
being silently skipped. Users can then resolve these via the new API:

- GET /api/setup/unresolved - list unresolved folders with search suggestions
- POST /api/setup/unresolved/{folder}/resolve - provide key to resolve folder

The SetupService.run() now:
- Tracks unresolved folders instead of skipping them
- Re-creates AnimeSeries for previously unresolved folders that are now resolved
- Includes unresolved count in logs

New files:
- src/server/api/setup_endpoints.py - API endpoints for unresolved management
- tests/unit/test_unresolved_folder_service.py - service and model tests

Modified:
- src/server/database/models.py - add UnresolvedFolder model
- src/server/database/service.py - add UnresolvedFolderService
- src/server/services/setup_service.py - track unresolved folders
- src/server/fastapi_app.py - include setup router

src/server/services/setup_service.py

@@ -20,7 +20,7 @@ import structlog
 
 from src.config.settings import settings
 from src.server.database.connection import get_db_session
-from src.server.database.service import AnimeSeriesService
+from src.server.database.service import AnimeSeriesService, UnresolvedFolderService
 from src.server.utils.dependencies import get_series_app
 
 logger = structlog.get_logger(__name__)
@@ -281,6 +281,7 @@ class SetupService:
         
         created_count = 0
         skipped_existing = 0
+        unresolved_count = 0
         
         try:
             series_app = get_series_app()
@@ -300,6 +301,43 @@ class SetupService:
                         skipped_existing += 1
                         continue
                     
+                    # Check if already tracked as unresolved
+                    existing_unresolved = await UnresolvedFolderService.get_by_folder_name(
+                        db, folder_name
+                    )
+                    if existing_unresolved and existing_unresolved.is_resolved:
+                        # Was previously unresolved but now resolved - create the series
+                        resolved_key = existing_unresolved.provider_key
+                        year = cls._extract_year_from_folder_name(folder_name)
+                        title = cls._extract_title_from_folder_name(folder_name)
+                        props = cls._get_series_properties(folder)
+                        
+                        series = await AnimeSeriesService.create(
+                            db=db,
+                            key=resolved_key,
+                            name=title,
+                            site="https://aniworld.to",
+                            folder=folder_name,
+                            year=year,
+                            loading_status="completed",
+                            episodes_loaded=True,
+                            logo_loaded=props.logo_loaded,
+                            images_loaded=props.images_loaded,
+                            has_nfo=props.has_nfo,
+                            nfo_path=props.nfo_path,
+                            nfo_created_at=props.nfo_created_at,
+                            nfo_updated_at=props.nfo_updated_at,
+                        )
+                        created_count += 1
+                        
+                        # Delete the unresolved tracking now that series is created
+                        await UnresolvedFolderService.delete(db, folder_name)
+                        continue
+                    elif existing_unresolved:
+                        # Already tracked as unresolved, skip
+                        unresolved_count += 1
+                        continue
+                    
                     # Extract title and year from folder name
                     year = cls._extract_year_from_folder_name(folder_name)
                     title = cls._extract_title_from_folder_name(folder_name)
@@ -315,8 +353,24 @@ class SetupService:
                     resolved_key = await cls._resolve_key_via_search(title)
                     
                     if not resolved_key:
+                        # Track unresolved folder for later manual resolution
+                        import json
+                        try:
+                            series_results = await series_app.search(title)
+                            search_result_json = json.dumps(series_results) if series_results else None
+                        except Exception:
+                            search_result_json = None
+                        
+                        await UnresolvedFolderService.create(
+                            db=db,
+                            folder_name=folder_name,
+                            title=title,
+                            year=year,
+                            search_attempts=1,
+                            last_search_result=search_result_json,
+                        )
                         logger.warning(
-                            "Could not resolve series key for folder, skipping: %s",
+                            "Could not resolve series key for folder, tracking as unresolved: %s",
                             folder_name
                         )
                         continue
@@ -357,7 +411,8 @@ class SetupService:
             logger.info(
                 "Setup complete",
                 created=created_count,
-                skipped_existing=skipped_existing
+                skipped_existing=skipped_existing,
+                unresolved=unresolved_count
             )
             
         except Exception as e: