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

package.json

@@ -1,6 +1,6 @@
 {
   "name": "iflow-engine",
-  "version": "1.0.0",
+  "version": "1.0.5",
   "description": "iFlow Engine SDK for Vue2, Vue3, React and HTML",
   "main": "./dist/iflow-engine.umd.js",
   "module": "./dist/iflow-engine.es.js",
@@ -59,7 +59,7 @@
     "vite-plugin-dts": "^4.5.4"
   },
   "dependencies": {
-    "iflow-engine-base": "^1.0.1",
+    "iflow-engine-base": "^1.0.5",
     "three": "^0.182.0"
   }
 }