* refactor: support explicit model list providers
* fix(web): preserve explicit model providers
* fix(web): preserve legacy provider prefixes on model updates
fix(models): normalize explicit provider-prefixed ids
fix(api): preserve legacy model updates across providers
fix(agent): preserve config identity for explicit provider refs
* fix ci
- stop exposing the raw Pico token to the frontend
- add /api/pico/info for non-secret Pico connection metadata
- proxy /pico/ws through the launcher with same-origin and dashboard auth checks
- inject the upstream Pico websocket protocol server-side
- update frontend chat connection flow and Vite websocket proxy path
- refresh related docs and tests