Register LM Studio as an OpenAI-compatible local provider and map the
new grok-4.3 thinking model for web executor requests.
This update also hardens related platform behavior by switching backup
archive creation to execFileSync, validating ACP agent ids, expanding
shared CORS handling, and making prompt injection guard failures return
an explicit 500 response.
To preserve existing stored credentials, encryption now derives new
keys from a secret-based salt while still falling back to the legacy
static-salt key during decryption.
- Add model playground page to dashboard (provider/model/endpoint selectors, Monaco editor, streaming, abort)
- Add CLI fingerprint matching (per-provider header/body ordering to match native CLI binaries)
- Add ACP module (CLI agent discovery, process spawner, session manager, API endpoint)
- Add playground to sidebar debug section with i18n support
- Close#192 and #200 as stale (v1.8.1, no repro info)
