- BridgeConfigStore: file-backed JSON config (configs/bridge.json)
- Auto-creates config file only when user saves via admin panel
- Hot-reload: watches config file every 5s, reloads adapters live
- Admin API: GET/PUT/DELETE /api/v1/admin/bridge/config/:name
- Frontend: full CRUD page with platform type selector + toggle
- Removed bridge env vars from .env.example