feat: remote control 支持 auto bind 功能 (#300)

* feat: acp-link 支持 --group 参数指定 channel group

- 添加 --group CLI flag，校验格式 [a-zA-Z0-9_-]+
- 支持 ACP_RCS_GROUP 环境变量 fallback
- 传递 channelGroupId 到 RcsUpstreamClient
- 更新 README 文档说明 --group 和相关环境变量

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

* fix: RCS 后端 session 复用与 group 绑定

- storeFindEnvironmentByMachineName 匹配 offline 状态，防止重连创建重复 session
- registerEnvironment 复用已有 session 而非每次新建
- EnvironmentResponse 返回 channel_group_id 字段
- 注册时将 session 绑定到 group ID，支持 web UI 按 group 查询
- apiKeyAuth 不再设置 uuid，由 uuidAuth 统一处理

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

* feat: Web UI Token Manager — 多 token 切换与 session 隔离

- 新增 useTokens hook 管理 localStorage token CRUD
- 新增 TokenManagerDialog 弹窗组件（添加/编辑/删除/切换 token）
- api client 支持Bearer token 认证，UUID 跟随 token 变化
- Navbar 添加 token 切换按钮
- 切换 token 时自动 reload，实现 session 数据隔离

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

* fix: 修复 useTokens useState 初始化函数签名错误

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

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

packages/acp-link/README.md

@@ -41,6 +41,9 @@ acp-link --https /path/to/agent
 # Disable authentication (dangerous)
 acp-link --no-auth /path/to/agent
 
+# Register to RCS with a specific channel group
+acp-link --group my-team /path/to/agent
+
 # Pass arguments to the agent (use -- to separate)
 acp-link /path/to/agent -- --verbose --model gpt-4
 ```
@@ -49,7 +52,7 @@ acp-link /path/to/agent -- --verbose --model gpt-4
 
 ```
 USAGE
-  acp-link [--port value] [--host value] [--debug] [--no-auth] [--https] <command>...
+  acp-link [--port value] [--host value] [--debug] [--no-auth] [--https] [--group value] <command>...
   acp-link --help
   acp-link --version
 
@@ -59,6 +62,7 @@ FLAGS
        [--debug]    Enable debug logging to file
        [--no-auth]  Disable authentication (dangerous)
        [--https]    Enable HTTPS with self-signed cert
+       [--group]    Channel group ID for RCS registration (letters, digits, hyphens, underscores only)
     -h  --help      Print help information and exit
     -v  --version   Print version information and exit
 
@@ -84,6 +88,18 @@ ws://localhost:9315/ws?token=<your-token>
 
 Set `ACP_AUTH_TOKEN` env var to use a fixed token, or use `--no-auth` to disable (not recommended).
 
+## RCS Upstream
+
+acp-link can register to a Remote Control Server (RCS) for remote access. Set the following environment variables:
+
+| Variable | Description |
+|----------|-------------|
+| `ACP_RCS_URL` | RCS server URL (e.g. `http://rcs.example.com:3000`) |
+| `ACP_RCS_TOKEN` | API token for RCS authentication |
+| `ACP_RCS_GROUP` | Channel group ID to lock the agent into (letters, digits, `-`, `_` only) |
+
+You can also use `--group <id>` on the CLI. The CLI flag takes priority over the env var.
+
 ## License
 
 MIT