- Updated all hooks to import and use AUTH_TOKEN_KEY constant from lib/constants
- Updated all components to use AUTH_TOKEN_KEY instead of hardcoded string
- Updated all atoms to use AUTH_TOKEN_KEY
- Updated all app pages to use AUTH_TOKEN_KEY
- Made CORS origin configurable via CORS_ORIGINS environment variable
- Added CORS_ORIGINS to .env.example with documentation
This improves maintainability by centralizing the auth token key string,
preventing typos and making it easier to change the key name if needed.
- Renamed "Documents" section to "Sources" in the dashboard layout.
- Updated routing for adding sources and managing documents.
- Refactored the connectors and documents upload pages to redirect to the new sources section.
- Added localization support for the new "Sources" terminology in English and Chinese.
