👑[Enhancement] 添加在加速前的网络连通性检测

### 🥰 需求描述(Description)
一些网站和网络环境会出现一些网络可以访问一些不可以的情况，无法知道加速之前和加速后的对比

### 🧐 解决方案(Solution)
在加速之前添加一个网络连通性检测

### 🚑 其他信息(Other Information)


The issue names no files, tests, or entry points. Start by locating the acceleration flow and its network requests, then determine what connectivity should be checked before acceleration and how results should be compared. Done means the pre-acceleration check works for the reported network conditions and its behavior is covered by appropriate tests.

Written by the indexing model from the issue text.