refactor `code` and `hybrid` modes for better type safety and configuration flexibility. add `_isProd` helper to standardize environment checks and improve plugin syncing warnings. adjust validation logic for clean JSON schema handling and enhance test coverage for modes.
- Changed the condition for syncSecretsOptions to check for both existence and false value.
- Added details about explicit fetch export and integration specifics in the introduction documentation.
- Clarified behavior of UI-only and code-only modes, including configuration application and schema syncing.
