feat(sdk): Python and JS SDKs for API v1.5.0

[Oanakiaja]

1.5.0

Features

• Forward Proxy Authentication: Add PROXY_AUTH_CMD / PROXY_AUTH_WATCH
  environment variables, supporting generic forward proxy authentication (e.g.,
  periodic token refresh) as a replacement for hardcoded credentials.

Bug Fixes

• Browser Auto-Recovery: Browser session now auto-recovers after all tabs are
  manually closed via VNC, eliminating the need to restart the container.
• WORKSPACE Follows Runtime USER: WORKSPACE directory is now dynamically
  determined based on the runtime USER, instead of using the build-time
  default.
• GOST Dynamic Proxy Fix: Fix upstream chain not correctly binding to the
  service handler during dynamic proxy mapping.

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1.5.0

Features

• 正向代理认证：新增 PROXY_AUTH_CMD / PROXY_AUTH_WATCH 环境变量，支持通用的正向代理认证方式（如定期刷新 token），替代硬编码凭据。

Bug Fixes

• 浏览器自动恢复：通过 VNC 手动关闭所有标签页后，浏览器 session 自动恢复，不再需要重启容器。
• WORKSPACE 跟随运行时 USER：WORKSPACE 目录现在根据运行时 USER 动态确定，而非使用构建时默认值。
• GOST 动态代理修复：修复动态 proxy mapping 时 upstream chain 未正确绑定到 service handler 的问题。