- Add URL input row to all docker container cards (defaulting to host.docker.internal:{port}), with Connect button, localStorage persistence, and green card border when reachable
- Map each docker container to its settings key (tts_url, nvidia_tts_url, nvidia_asr_url, tts_stream_url) via DC_USE_MAP; add "Use as TTS/STT" button that applies the URL to settings
- Add "+ Add Custom" button to LLM / STT / TTS sub-page headers, opening a dialog with Name, Role, URL, optional Docker container name, and Description fields
- Custom cards are saved to localStorage, rendered in dc-grid-llm/stt/tts alongside docker cards, have URL input + Use-as + Remove buttons; container name field enables Stop/Start/Restart
- Expose applyAndSaveSettings and probeUrl as window globals so docker card bindings can call them after renderLocalContainers
- Add dialog CSS and .dc-delete-btn red variant
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>