feat: add settings dialog with render mode selection

- 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

package.json

@@ -1,6 +1,6 @@
 {
   "name": "iflow-engine",
-  "version": "1.1.6",
+  "version": "1.1.7",
   "description": "iFlow Engine SDK for Vue2, Vue3, React and HTML",
   "main": "./dist/iflow-engine.umd.js",
   "module": "./dist/iflow-engine.es.js",