feat(app): move chat to local AI runtimes

[NarwhalChen]

Summary

• add validated local AI IPC contracts and a context-isolated preload bridge
• run authenticated Claude Code and Codex CLI providers from the Electron Main process
• stream AI SDK chat events into the existing local renderer and Dexie history
• remove Electron cloud auth, account, usage, speech, endpoint, and deep-link surfaces
• preserve the existing local atomic automation runtime

Split boundary

This is the first extracted slice of #206. It establishes the local chat/runtime foundation only. Request-scoped tools, Codex tool rendering, computer control, and the Settings provider toggle are intentionally left for follow-up PRs.

Verification

• pnpm --filter @convera/app test — 10 files / 36 tests
• pnpm --filter @convera/app lint — 0 errors, 7 existing warnings
• pnpm --filter @convera/app exec tsc --noEmit --skipLibCheck
• pnpm --filter @convera/app automation:typecheck

Scope

• no changes to packages/website
• no changes to ~/proj/foxychat-server
• no CI workflow added

[vercel]

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Project	Deployment	Actions	Updated (UTC)
foxyfox-website	Blocked		Jul 30, 2026 1:24pm

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
foxyfox-docs	Skipped		Jul 30, 2026 1:24pm

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