feat: add settings for daemon host and port in browser extension

[zarkin404]

Description

• Introduced a settings section in the popup to allow users to configure the daemon host and port.
• Implemented storage functionality to save and retrieve these settings.
• Updated connection logic to use the configured host and port for WebSocket connections.
• Enhanced the background script to handle changes in the stored settings and reconnect accordingly.
• Bumped version to 1.5.5 to reflect these changes.

Related issue:

Type of Change

• 🐛 Bug fix
• ✨ New feature
• 🌐 New site adapter
• 📝 Documentation
• ♻️ Refactor
• 🔧 CI / build / tooling

Checklist

• I ran the checks relevant to this PR
• [] I updated tests or docs if needed
• [] I included output or screenshots when useful

Documentation (if adding/modifying an adapter)

• Added doc page under docs/adapters/ (if new adapter)
• Updated docs/adapters/index.md table (if new adapter)
• Updated sidebar in docs/.vitepress/config.mts (if new adapter)
• Updated README.md / README.zh-CN.md when command discoverability changed
• Used positional args for the command's primary subject unless a named flag is clearly better
• Normalized expected adapter failures to CliError subclasses instead of raw Error

Screenshots / Output

PR 目的

有些场合下，浏览器和 OpenCli 的运行环境并不一定在同一台主机上，譬如 OpenCli 被远程服务器上的 OpenClaw 启动，而自己的电脑则运行这安装了插件的浏览器，所以需要浏览器连到远程服务器上的 OpenCli Daemon，远程服务器可以通过 frpc 将 Daemon 的监听端口暴露到公网，以便于插件链接，进而规避目标平台的 IP 检测或者其他风控检测。

附 frpc.toml 配置：

[[proxies]]
name = "opencli"
type = "tcp"
localPort = 19825
remotePort = 23333

浏览器插件配置：
Daemon host: 服务器 ip
Daemon port: 23333 （记得防火墙和安全组要放行该端口）