Part 1 of CLIProxyAPI integration (#902).
- DB migration for version_manager + upstream_proxy_config tables
- DB modules: versionManager.ts (tool lifecycle CRUD), upstreamProxy.ts (proxy config CRUD + SSRF guard)
- localDb.ts re-exports for new modules
- Provider registration: UPSTREAM_PROXY_PROVIDERS in providers.ts
- Zod validation schemas for version-manager API routes
- Settings UI: CliproxyapiSettingsTab (Advanced tab)
- 47 unit tests for DB modules