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

src/managers/engine-manager.ts

@@ -685,6 +685,26 @@ export class EngineManager extends BaseManager {
 
     // ==================== 结束：构件操作 ====================
 
+    // ==================== 渲染模式 ====================
+
+    /**
+     * 获取当前渲染模式
+     * @returns 'simple' | 'balance' | 'advanced'
+     */
+    public getRenderMode(): string {
+        return this.engineInstance?.getRenderMode() ?? 'balance';
+    }
+
+    /**
+     * 设置渲染模式
+     * @param mode 'simple' | 'balance' | 'advanced'
+     */
+    public setRenderMode(mode: 'simple' | 'balance' | 'advanced'): void {
+        this.engineInstance?.setRenderMode(mode);
+    }
+
+    // ==================== 结束：渲染模式 ====================
+
     /** 销毁引擎管理器 */
     public destroy(): void {
         if (this.engineInstance) {