fix: API升级v5、错误提示优化、体重必填移除等

- selectMemberDrawer: v3→v5 API升级
- lefu/service: 统一错误提示文案
- equipmentMember: 修复删除确认弹框文案
- home: 优化加载中提示
- supplementPersonal: 移除体重必填校验

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

miniprogram/pages/home/home.ts

@@ -151,7 +151,7 @@ Page({
         this._otaChecked = true
         lefuService.checkAndUpgrade()
             .then(() => {
-                wx.showLoading({ title: '固件升级中...', mask: true })
+                wx.showLoading({ title: '加载中...', mask: true })
                 setTimeout(() => {
                     wx.hideLoading()
                     // 升级完成后设备重启，旧连接与订阅失效，重新扫描连接