feat(menu): add cancel translucent option to right-click menu

- Add cancelTranslucent i18n translations (zh-CN: 取消半透明, en-US: Cancel Translucent)
- Add unTranslucentModel() method to Engine layer
- Add unTranslucentModel() proxy to EngineManager
- Add menu item after 'Transparent Selected' (order: 4)
- Update menu item order numbers (5-8)

src/components/engine/index.ts

@@ -819,6 +819,17 @@ export class Engine implements IBimComponent {
         }
     }
 
+    /**
+     * 取消半透明
+     */
+    public unTranslucentModel(): void {
+        if (!this._isInitialized || !this.engine?.modelToolModule) {
+            console.warn('[Engine] Cannot cancel translucent: engine not initialized.');
+            return;
+        }
+        this.engine.modelToolModule.unTranslucentModel();
+    }
+
     /**
      * 隔离选中构件（隐藏其他）
      */