feat: 优化前端页面和组件

- 重构 Agents 页面
- 优化 Knowledge 页面
- 更新侧边栏导航
- 添加前端依赖

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

web/package.json

@@ -21,6 +21,7 @@
     "vue-router": "^4.3.0"
   },
   "devDependencies": {
+    "@types/papaparse": "^5.5.2",
     "@vitejs/plugin-vue": "^5.0.4",
     "autoprefixer": "^10.4.19",
     "postcss": "^8.4.38",