Merge branch 'dev'

feat(routing): optimize Claude model routing and add quota fallback

Merge branch 'dev'

feat: dynamic model refresh & hot-reload backend accounts

Merge branch 'dev'

fix: add checkpoint to error path & fix edit_file_v2 new file creation

Merge branch 'dev'

feat: add upstream model discovery for Claude API accounts

chore: merge dev into main

refactor(protocol-bridge): unify backend account state persistence

feat: integrate Claude API pool and platform updates

feat: add multi-account backend pools and deploy sync

fix(protocol-bridge): handle orphaned tool calls from closed BiDi streams

fix(protocol-bridge): clear stale pending tool calls to prevent deadlock

feat: implement knowledge base endpoints and improve worker rate limiting