fix: comprehensive security, quality and consistency fixes

Server:
- Block startup with default JWT secrets in production
- Make subscription verify admin-only (no payment integration yet)
- Add device ownership validation on command/result, event, treatment/sync
- Remove admin token from request body fallback
- Add pageParams boundary protection (pageSize capped at 100)
- Fix COS getObjectUrl to use callback-based Promise
- Add settings key whitelist matching frontend fields
- Add user existence check before subscription creation
- Fix firmware always returning has_update:true
- Replace hardcoded trial subscription with actual DB query
- Extract shared utilities (limitClause, toMysqlDate, formatDate)

Miniprogram:
- Replace fake PD random data with placeholder
- Mark client-timer treatment completions with source field
- Disable mock.js
- Fix BLE listener leaks (save refs, cleanup in onUnload)
- Fix ble.off clearing all listeners (pass specific callback)
- Add BLE disconnect detection via onBLEConnectionStateChange
- Fix subscription status type consistency (number not string)
- Fix scan callback accumulation in ble.js
- Fix history stats accumulation across pages
- Fix subscribe-success/treatment-done hardcoded values
- Fix profile subscription view logic
- Replace purchase flow with admin-contact modal
- Add error logging in command-sync report

Admin console:
- Fix AdminLayout logout (require->import, logout->clearToken)
- Remove all mock data from production request.js
- Replace dashboard fake data with real API calls
- Replace monthly_revenue with subscription_count
- Fix subscription stats fallback (|| -> ??)
- Add token expiry tracking (7 days)
- Unify device status map and subscription status text
- Fix user page record link navigation
- Fix subscription createForm.user_id type handling
- Add error feedback in all empty catch blocks
- Remove unused remember checkbox and uview-plus dependency
- Extract common CSS to shared stylesheet (-900 lines)
- Extract formatDate to shared utils/format.js
- Show real admin name in layout header

miniprogram/pages/ble-connect/ble-connect.js

@@ -24,6 +24,7 @@ Page({
   onUnload: function () {
     clearTimeout(this._scanTimer)
     ble.stopScan()
+    if (this._onBindResult) ble.off('bind_result', this._onBindResult)
   },
 
   startBleConnect: function () {
@@ -55,7 +56,7 @@ Page({
   doBind: function () {
     var self = this
     var userId = app.globalData.userId || ''
-    ble.on('bind_result', function (result) {
+    this._onBindResult = function (result) {
       if (result.success) {
         http.post('/api/v1/device/bind/confirm', {
           device_id: self.data.deviceId,
@@ -71,7 +72,8 @@ Page({
       } else {
         self.setData({ state: 'error', error: '设备绑定失败' })
       }
-    })
+    }
+    ble.on('bind_result', this._onBindResult)
 
     ble.bindDevice(userId, self.data.bindToken).catch(function (err) {
       self.setData({ state: 'error', error: err.error_msg || '绑定命令失败' })