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/services/ble/connection.js

@@ -1,7 +1,6 @@
 // BLE connection: scan, connect, disconnect, reconnect logic
 
 var protocol = require('./protocol')
-var devConfig = require('../../config/env')
 var SERVICE = protocol.SERVICE
 var CHAR = protocol.CHAR
 
@@ -254,10 +253,6 @@ function startScan(callbacks) {
               var localName = (d.localName || '').toUpperCase()
               var matched = name.indexOf('HOX') !== -1 || localName.indexOf('HOX') !== -1 ||
                   name.indexOf('LIGHTMASK') !== -1 || localName.indexOf('LIGHTMASK') !== -1
-              // Dev board name - only match in dev mode
-              if (!matched && devConfig.__DEV__) {
-                matched = name.indexOf('SIMPLE PERIPHERAL') !== -1 || localName.indexOf('SIMPLE PERIPHERAL') !== -1
-              }
               if (matched) {
                 wx.stopBluetoothDevicesDiscovery({})
                 if (callbacks.onFound) callbacks.onFound(d)