feat: upgrade iflow-engine-base to v1.0.5, add pause/resume rendering API

- Update iflow-engine-base from 1.0.1 to 1.0.5
- Change default engine version from v1 to v2
- Add pauseRendering() and resumeRendering() methods
- Add switch model feature in demos
- Update model URLs in demos
- Add new documentation files

src/components/engine/index.ts

@@ -59,7 +59,7 @@ export class Engine implements IBimComponent {
         // 保存配置选项（设置默认值）
         this.options = {
             backgroundColor: 'linear-gradient(to bottom, rgb(214, 224, 235), rgb(246, 250, 255))', // 固定背景渐变色
-            version: options.version ?? 'v1', // 默认使用 v1 版本
+            version: options.version ?? 'v2', // 默认使用 v2 版本
             showStats: options.showStats ?? false, // 默认不显示统计
             showViewCube: options.showViewCube ?? true, // 默认显示视图立方体
         };
@@ -179,6 +179,28 @@ export class Engine implements IBimComponent {
         return this.engine;
     }
 
+    /**
+     * 暂停渲染
+     */
+    public pauseRendering(): void {
+        if (!this._isInitialized || !this.engine) {
+            console.warn('[Engine] Engine not initialized.');
+            return;
+        }
+        this.engine.pauseRendering();
+    }
+
+    /**
+     * 恢复渲染
+     */
+    public resumeRendering(): void {
+        if (!this._isInitialized || !this.engine) {
+            console.warn('[Engine] Engine not initialized.');
+            return;
+        }
+        this.engine.resumeRendering();
+    }
+
     // ==================== 测量功能方法 ====================
 
     /**