feat: 更新前端页面

- Agents, Chat, Skill 页面
- useSkills composable
- package.json 更新

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/package.json

@@ -11,6 +11,7 @@
   "dependencies": {
     "@vue-office/docx": "^1.6.3",
     "@vue-office/excel": "^1.7.14",
+    "axios": "^1.13.6",
     "echarts": "^6.0.0",
     "element-plus": "^2.13.3",
     "lucide-vue-next": "^0.577.0",