- Add Instances tab to LuCI Streamlit dashboard
- RPCD backend: list/add/remove/enable/disable instances
- API module: instance management methods
- UI: Instance table with status, port, enable/disable/remove actions
- Add Instance form with app selector and auto port assignment
- Apply & Restart button to apply instance changes
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>