feat: 目标改为动态列表、访问端口全自动；菜单栏合并通道组；接入记录可按地址查看

添加通道
- 目标服务改成列表：每行一台主机，多个端口用逗号隔开（也支持 8080-8082、主机范围）；
  「添加主机」沿用上一行的端口，粘贴一串 IP / 主机:端口会自动拆成多行
- 新建时不再手动指定对外端口，统一自动分配；预览里列出每个地址分到的端口，
  连通性测试并发进行，结果标在每个地址后面
- 超过一个地址自动放进以名称命名的新通道组（也可选加入已有组），只有一个地址时为不分组；
  编辑通道仍保留端口栏和「新建通道组」
- 网页面板同步：同样的目标列表、自动端口与通道组规则

菜单栏
- 同一个通道组合并为一行「组名（N 个地址）」，子菜单里整组开关、逐个地址开关

连接与授权（通道组）
- 当前在线、历史接入台账增加「按设备 / 按地址」切换：按地址列出组内每个地址
  有几台设备在用、谁访问过；按设备的汇总行显示访问了组内哪些地址，并带上授权姓名
- 网页面板的在线连接同样可以按地址查看

README_EN.md

@@ -58,7 +58,7 @@ PortRelay turns that into three steps:
 - When approval is required, the app shows a system notification and you approve or deny with one click. The requester's page refreshes on its own.
 - **The access clock starts at the first connection**, so a teammate can accept an invite now and use it later.
 - When access expires or is revoked, **existing connections are dropped too**. Unauthorized connections are reset (TCP RST) and logged.
-- **Tunnel groups**: the add-tunnel form accepts several targets at once (for example `10.0.1.11-13:22, 10.0.1.11:8080`), creates one tunnel per address on a contiguous block of gateway ports and puts them in one group. A group shares one invite link and one set of grants: a teammate is authorized once for the whole group, and one revoke disconnects them everywhere.
+- **Tunnel groups**: the add-tunnel form takes a list of targets, one host per row with comma-separated ports (a pasted list of IPs is split into rows), creates one tunnel per address on a contiguous block of gateway ports and puts them in one group. A group shares one invite link and one set of grants: a teammate is authorized once for the whole group, and one revoke disconnects them everywhere.
 
 **Tunnel lifecycle**
 
@@ -217,11 +217,11 @@ Open ⚙️ Settings and fill in:
 
 ### 3. Create a tunnel and invite someone
 
-1. Click **添加通道** (Add tunnel) and enter a name and a target such as `10.0.1.16:3306`. You can probe the target from your machine first, and a free port is suggested automatically.
+1. Click **添加通道** (Add tunnel) and enter a name, a target host and port such as `10.0.1.16` and `3306`. You can probe the target from your machine first; the gateway port is assigned automatically.
 2. Keep the default access mode, **仅授权链接** (invite-only). Click **邀请** (Invite), then choose how long access lasts, how many devices may use the link, and whether approval is required.
 3. Send the generated message or QR code. Once the teammate has entered their name, they can connect their database client or SSH to `192.168.1.10:33660`.
 
-To open several hosts at once (a set of servers, say), use the same **添加通道** (Add tunnel) form and enter `10.0.1.11-13:22` as the target. The form previews the port mapping and selects 新建通道组 (New tunnel group); idle close, bandwidth and access settings apply to every address. Then click **邀请整组** (Invite group). To add addresses later, click **添加地址** (Add address) on the group card; an existing tunnel can join a group from its edit form.
+To open several hosts at once (a set of servers, say), use the same **添加通道** (Add tunnel) form with one host per row (comma-separated ports; you can paste a list of IPs). The form previews the port mapping and puts the addresses in a new tunnel group; idle close, bandwidth and access settings apply to every address. Then click **邀请整组** (Invite group). To add addresses later, click **添加地址** (Add address) on the group card; an existing tunnel can join a group from its edit form. A group's connections and history can be viewed by device or by address.
 
 ## Configuration