fix: address critical security and data integrity issues from cross-audit

- Add expire_time > NOW() filter to findActive() preventing stale subscriptions
- Add express-rate-limit on login endpoints (user: 10/15min, admin: 5/15min)
- Add production guard for default admin credentials
- Fix BLE bindDevice userId encoding (uint32 instead of hexToBytes on numeric)
- Wrap adminCreate in transaction to prevent race condition
- Add settings cache invalidation after admin saves
- Read trial_days from settings instead of hardcoding 7
- Fix double JSON.stringify in commandDao.finish call
- Cancel stale pending bindings before creating new ones
- Reduce token refresh grace period from 3 days to 1 day
- Fix subscribe-success to fetch expiry from server (correct for renewals)
- Add keep-alive name property to DashboardView and SettingsView
- Fix BLE disconnect() to preserve listener registrations across reconnects

miniprogram/pages/subscribe-success/subscribe-success.js

@@ -1,3 +1,5 @@
+var api = require('../../utils/api')
+
 Page({
   data: {
     statusBarHeight: 44,
@@ -14,21 +16,32 @@ Page({
   },
 
   onLoad: function (options) {
+    var self = this
     var app = getApp()
-    this.setData({ statusBarHeight: app.globalData.statusBarHeight })
+    self.setData({ statusBarHeight: app.globalData.statusBarHeight })
 
     var planMap = { yearly: '年卡会员', monthly: '月卡会员', trial: '试用会员' }
-    var durationMap = { yearly: 365, monthly: 30, trial: 7 }
     var plan = options.plan || 'yearly'
+    self.setData({ planName: planMap[plan] || '会员' })
 
-    var now = new Date()
-    now.setDate(now.getDate() + (durationMap[plan] || 365))
-    var y = now.getFullYear()
-    var m = ('0' + (now.getMonth() + 1)).slice(-2)
-    var d = ('0' + now.getDate()).slice(-2)
-    this.setData({
-      planName: planMap[plan] || '会员',
-      expiryDate: y + '年' + m + '月' + d + '日'
+    // Fetch actual subscription expiry from server instead of computing client-side
+    api.getSubscription().then(function (res) {
+      if (res && res.expire_time) {
+        var date = new Date(res.expire_time)
+        var y = date.getFullYear()
+        var m = ('0' + (date.getMonth() + 1)).slice(-2)
+        var d = ('0' + date.getDate()).slice(-2)
+        self.setData({ expiryDate: y + '年' + m + '月' + d + '日' })
+      }
+    }).catch(function () {
+      // Fallback: compute from current date if server call fails
+      var durationMap = { yearly: 365, monthly: 30, trial: 7 }
+      var now = new Date()
+      now.setDate(now.getDate() + (durationMap[plan] || 365))
+      var y = now.getFullYear()
+      var m = ('0' + (now.getMonth() + 1)).slice(-2)
+      var d = ('0' + now.getDate()).slice(-2)
+      self.setData({ expiryDate: y + '年' + m + '月' + d + '日' })
     })
   },