- Add SettingDialogManager with radio-style render mode picker (simple/balance/advanced)
- Add getRenderMode/setRenderMode API to Engine and EngineManager layers
- Wire setting toolbar button to toggle the settings dialog
- Add i18n keys for settings dialog (zh-CN/en-US)
- Add version display at bottom-right of engine wrapper
- Bump version to 1.1.7, rebuild and sync demo libs