Fix frontend compatibility with paginated API response

- Update frontend API client to extract items from paginated response
- Fix SPA routing to serve index.html for /project/* paths on refresh

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

backend/app/main.py

@@ -57,11 +57,12 @@ if os.path.exists(static_dir):
     # Catch-all for SPA routing (must be last)
     @app.get("/{full_path:path}")
     async def serve_spa_routes(full_path: str):
-        # Don't catch API routes
-        if full_path.startswith("api/") or full_path.startswith("health") or full_path.startswith("project/"):
+        # Don't catch API routes or health endpoint
+        if full_path.startswith("api/") or full_path.startswith("health"):
             from fastapi import HTTPException
             raise HTTPException(status_code=404, detail="Not found")
 
+        # Serve SPA for all other routes (including /project/*)
         index_path = os.path.join(static_dir, "index.html")
         if os.path.exists(index_path):
             return FileResponse(index_path)