fix(platform): 隧道不再强制单协议族，改用 happy-eyeballs 自动选路#394
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之前 tunnel-client 会把 binding 里的 ipFamily 透传给所有 WebSocket 构造器（family: 4|6），强制只用 IPv4 或 IPv6。当某条协议族路由 有 ECMP 黑洞时（实测 ~35% 丢包率），每次 restart 冷启动都有概率 连不上平台，导致 dashboard 显示「未授权」、平台侧机器离线。 修复： - tunnel-client.ts: 控制连接和数据流都不传 family，让 Node 内置 happy-eyeballs (autoSelectFamily) 同时拨 IPv4+IPv6，谁先到用谁 - 移除 setPlatformIpFamily 运行时落盘：不再因一次侥幸连接把 ipFamily 写回 platform.json 锁死坏路径 - bind.ts: 仍保留多族兜底尝试（bind HTTP 请求需要实际打通）， 但不再把成功的协议族写入绑定文件 - binding.ts: 删除 setPlatformIpFamily（无调用方） 测试：更新 platform-bind-ip-family.test.ts 和 tunnel-client-ip-family.test.ts 验证新行为。
family-flip 逻辑移除后，connectFails 只剩写入（自增/清零）无人读取， 且注释仍称其「驱动 backoff + 协议族翻转」——两者皆已不成立。删除该变量 并更正注释，重连退避由独立的 backoff 变量驱动。
隧道改用 happy-eyeballs 后运行期已不再读取该字段、bind 也不落盘， 旧注释仍称「固定走该协议族」会误导。标注 @deprecated 并说明仅为 兼容旧 platform.json 保留解析。（Codex 二轮 review P3）
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问题
botmux restart 后概率性出现 dashboard 显示「平台未授权」、平台侧机器显示离线。
根因：tunnel-client.ts 会把 platform.json 里的 ipFamily 透传给所有 WebSocket 构造器，强制只用单一协议族。当该协议族路由有 ECMP 黑洞时（实测 ~35% 丢包率），冷启动时控制连接连不上平台。更糟的是，某次侥幸连上后会把 ipFamily 写回绑定文件，锁死在坏路径上。
修复
影响面
测试验证