chore: remove all mock/debug code for production release

Miniprogram:
- ENV switched to 'prod' (disables __DEV__ flag)
- Deleted mock.js and test-ble-frame.js
- Removed mockBind/mockPurchase from api.js
- Removed all debug UI panels and onMock* handlers from 6 pages
- Removed mock purchase fallback in subscribe-plans
- Removed SIMPLE PERIPHERAL dev board from BLE scan

Server:
- Removed /device/mock-bind route
- Removed /subscription/mock-purchase route
- Removed dev_openid fallback in wechat.js
- Removed mockBind() from binding.dao.js
- Removed mock fallback in purchase endpoint
- NODE_ENV default changed to 'production'

Admin:
- ENV switched to 'prod'

All mock code preserved in 'test' branch for future development use.

miniprogram/pages/index/index.js

@@ -1,6 +1,5 @@
 var ble = require('../../services/ble')
 var api = require('../../utils/api')
-var config = require('../../config/env')
 var app = getApp()
 
 Page({
@@ -14,14 +13,9 @@ Page({
     bleState: 'disconnected',
     hasDevice: false,
     deviceInfo: null,
-    devMode: false,
     loading: true
   },
 
-  onLoad: function () {
-    this.setData({ devMode: config.__DEV__ || false })
-  },
-
   onShow: function () {
     this.checkState()
     this._onStatus = this.onBleStatus.bind(this)
@@ -173,26 +167,6 @@ Page({
     wx.navigateTo({ url: '/pages/wear-check/wear-check' })
   },
 
-  onMockBind: function () {
-    var self = this
-    wx.showModal({
-      title: '模拟绑定',
-      editable: true,
-      placeholderText: '输入设备编号（需先在后台创建）',
-      success: function (res) {
-        if (res.confirm && res.content) {
-          var deviceId = res.content.trim()
-          api.mockBind(deviceId).then(function () {
-            wx.showToast({ title: '模拟绑定成功', icon: 'success' })
-            self.checkState()
-          }).catch(function (err) {
-            wx.showToast({ title: err.message || '绑定失败', icon: 'none' })
-          })
-        }
-      }
-    })
-  },
-
   onViewSubscription: function () {
     wx.navigateTo({ url: '/pages/subscribe-plans/subscribe-plans' })
   }

miniprogram/pages/index/index.wxml

@@ -9,10 +9,6 @@
       <text class="empty-icon">📱</text>
       <view class="empty-text">还没有绑定设备</view>
       <button class="btn-primary mt-30" bindtap="onAddDevice">扫码添加设备</button>
-      <view class="debug-actions" wx:if="{{devMode}}">
-        <view class="debug-label">🔧 调试工具</view>
-        <button class="btn-secondary btn-sm" bindtap="onMockBind">模拟绑定设备</button>
-      </view>
     </view>
   </view>