feat(setup): add unresolved folders GUI for manual series resolution

- Add /setup/unresolved page for manual provider key resolution
- Integrate unresolved check into setup wizard flow
- Auto-redirect to unresolved page if folders need resolution

After initial setup scan, folders that couldn't be auto-resolved
are now tracked and can be resolved manually via the GUI.

Endpoints:
- GET /api/setup/unresolved - list unresolved folders
- POST /api/setup/unresolved/{folder}/resolve - resolve with provider key
- POST /api/setup/unresolved/{folder}/search - re-search for suggestions
- DELETE /api/setup/unresolved/{folder} - delete without adding

src/server/controllers/page_controller.py

@@ -59,3 +59,13 @@ async def loading_page(request: Request):
         request,
         title="Initializing - Aniworld"
     )
+
+
+@router.get("/setup/unresolved", response_class=HTMLResponse)
+async def unresolved_page(request: Request):
+    """Serve the unresolved folders resolution page."""
+    return render_template(
+        "unresolved.html",
+        request,
+        title="Resolve Series - Aniworld"
+    )