Automate Env mirror selection and Python venv activation

[Copilot]

Installation no longer requires users to select a regional command. Linux and Windows detect the network region, clone from the suitable mirror, then restore repository remotes to GitHub.

• Automatic mirror selection

  • Detect China-based IPs via ipinfo.io.
  • Use regional mirrors for installer dependencies and Env repository clones.
  • Reset cloned packages, sdk, and env remotes to GitHub.

• Virtual environments

  • env.sh now creates and activates ~/.env/.venv on first use.
  • Installs Env dependencies inside the venv.
  • Cleans up incomplete venvs and reports setup failures.
  • Adds python3-venv to Ubuntu and SUSE prerequisites.

source ~/.env/env.sh
# Creates and activates ~/.env/.venv on first use

• Windows setup

  • Applies automatic mirror detection to Git, pip, and Env bootstrap downloads.
  • Corrects the existing .env replacement prompt behavior.

• Documentation

  • Removes region-specific installation commands and obsolete mirror troubleshooting.
  • Documents automatic mirror selection and first-use venv activation.

[BernardXiong]

@copilot 在linux下的安装shell脚本中，下载 raw.githubusercontent.com 的文件可能会存在下载不成功的问题，所以希望在从 raw.githubusercontent.com 中下载就先行判断地区：

• 在wget下载时，还是手动的依据自身情况来从不同git仓库下载，这部分在README.md 中依然保留文字说明；
• install_*.sh 需要优先判断地区，然后再确定如何进行安装。

[Copilot]

@copilot 在linux下的安装shell脚本中，下载 raw.githubusercontent.com 的文件可能会存在下载不成功的问题，所以希望在从 raw.githubusercontent.com 中下�...

已处理，最终提交 672cf01：Ubuntu、SUSE、Arch 安装脚本会先检测地区，再从 Gitee 或 GitHub 下载 touch_env.sh；检测失败时交互选择镜像，非交互环境默认 GitHub。README 也恢复了下载安装脚本时手动选择 Gitee/GitHub 地址的说明。