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/wear-check/wear-check.js

@@ -1,13 +1,10 @@
 var ble = require('../../services/ble')
-var config = require('../../config/env')
-
 Page({
   data: {
     statusBarHeight: 44,
     checking: false,
     result: null,
     error: '',
-    devMode: false,
     battery: 0,
     connected: false
   },
@@ -22,7 +19,7 @@ Page({
 
   onLoad: function () {
     var app = getApp()
-    this.setData({ statusBarHeight: app.globalData.statusBarHeight, devMode: config.__DEV__ || false })
+    this.setData({ statusBarHeight: app.globalData.statusBarHeight })
     var device = app.globalData.currentDevice || {}
     this.setData({
       battery: device.battery || 0,
@@ -108,7 +105,4 @@ Page({
     }, 500)
   },
 
-  onMockWearOk: function () {
-    this.setData({ checking: false, result: 'ok' })
-  }
 })