Add a "Import from CC-Switch" button to the web provider management
page. The backend reads the cc-switch SQLite database directly using
modernc.org/sqlite (pure Go, no CGO/sqlite3 CLI dependency), and the
frontend shows a modal with checkboxes to select which providers to
import as global providers.
- Add GET/POST /api/v1/providers/cc-switch management API endpoints
- Replace sqlite3 CLI usage with database/sql + modernc.org/sqlite
- Add CCSwitchImportModal component with i18n support (5 languages)
Made-with: Cursor