PROBLEM: Port 5000 already used by Apple AirTunes
ERROR: 403 Forbidden when calling API
SOLUTION: Changed backend to port 5001
CHANGES:
- tools/asset_backend.py: app.run(port=5001)
- tools/visual_asset_manager.html: Updated all API calls to :5001
BACKEND NOW RUNNING: http://localhost:5001
HEALTH CHECK: ✅ Working
Test: curl http://localhost:5001/api/health
Response: {"status": "ok"}
