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* feat(wechat): M5 微信 JS-SDK 扫码签到——jssdk-signature 接口与微信内扫一扫
后端新增 wechat 模块：access_token / jsapi_ticket 内存缓存（tokio RwLock，提前
300s 刷新）与 plain SHA1 签名；GET /api/wechat/jssdk-signature?url= 供前端
wx.config，url 自动去除 # 及其后部分。凭证经 WECHAT_APP_ID / WECHAT_APP_SECRET
注入，未配置返回 40307 而非 panic。
前端新增 MicroMessenger UA 检测与 jweixin 动态注入（幂等），房间页底栏在微信内
新增「微信扫一扫」主按钮，扫码结果与相机扫码同路径（本地预校验 → share_qr
推送全房间）；非微信环境保持相机扫码。
* fix(wechat): 消除 NodeListOf 迭代告警并加固微信扫一扫取消处理
- 测试改用 Array.from，消除 IDE 对 for...of NodeListOf 的类型告警（本项目
tsconfig lib 为 ES2023+DOM，未含 DOM.Iterable；tsc -b 实际不受影响）
- wx.scanQRCode 的 scanType 限定为 qrCode，避免误扫条形码
- fail 回调 errMsg 含 cancel 时按用户取消处理（部分微信版本行为），返回 null
* feat(wechat): 新增 status 可用性预检查与 VITE_WX_DEBUG 真机调试开关
参照参考实现 qrcode_share：
- 后端新增 GET /api/wechat/status（免会话）返回 {available, reason}，只暴露
「是否已配置」不含凭证
- 前端环境预检查：房间页仅在「微信内 且 后端判定可用」时才渲染「微信扫一扫」
入口，未配置时完全不显示，避免点击后才报 40307
- VITE_WX_DEBUG=true 时 wx.config({debug:true})，真机以弹窗输出签名校验细节，
便于定位 invalid signature（默认关闭）
备案号通过 VITE_ICP_BEIAN 注入（生产机 frontend/.env.local，已 gitignore），未配置时组件返回 null 零 DOM 痕迹；仓库与开源发布不含任何具体号码，部署方可随时 git pull 更新而不冲突。
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变更说明
dev→main发版合并，包含两个已 squash 合入dev的 feature：backend/src/wechat/：GET /api/wechat/jssdk-signature?url=（需会话）与GET /api/wechat/status（免会话可用性探测，不泄露凭证）WechatClient内存缓存access_token/jsapi_ticket（7200s，提前 300s 刷新，tokio::sync::RwLock）；签名串取 plain SHA1，url自动去除#及其后部分WECHAT_APP_ID/WECHAT_APP_SECRET注入，未配置时返回 40307（不 panic）src/lib/wechat.ts（UA 检测 + jweixin 1.6.0 幂等注入 +wx.config→wx.scanQRCode）与src/api/wechat.ts；房间页底栏在「微信内 且 后端可用」时展示「微信扫一扫」，非微信环境保持相机扫码VITE_WX_DEBUG真机调试开关（默认关闭）VITE_ICP_BEIAN注入；未配置时组件return null零 DOM 痕迹，配置后登录页底部展示并链接工信部frontend/.env.local（已 gitignore），仓库与开源发布不含任何具体号码，可随时git pull更新变更类型
feat新功能fix缺陷修复docs文档refactor重构（不改行为）chore构建/依赖/杂项目标分支
dev（feature/fix 常规合并）main（仅发版合并，dev → main）自查清单
feat/fix/docs/chore/+ 简短描述），基于最新dev创建cargo fmt --check/cargo clippy -D warnings/cargo test通过（后端改动）eslint/tsc --noEmit/ 测试 / 构建通过（前端改动）unwrap()（测试代码除外）、无unsafe、无any关联 issue / 备注