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.

server/src/routes/device.js

@@ -56,23 +56,6 @@ router.post('/device/bind/confirm', requireUser, wrap(async (req, res) => {
   }))
 }))
 
-router.post('/device/mock-bind', requireUser, wrap(async (req, res) => {
-  const config = require('../config')
-  if (config.nodeEnv === 'production') return res.json(fail(2001, 'not available in production'))
-  const deviceId = String(req.body.device_id || '').trim()
-  if (!deviceId) return res.json(fail(2001, 'device_id required'))
-
-  const active = await bindingDao.findActiveByUser(req.user.user_id)
-  if (active) return res.json(fail(2001, '已绑定设备', { device_id: active.device_id }))
-
-  const device = await bindingDao.findDeviceExists(deviceId)
-  if (!device) return res.json(fail(1005, 'DEVICE_NOT_FOUND'))
-
-  await bindingDao.mockBind(req.user.user_id, deviceId)
-  await logDao.write({ user_id: req.user.user_id, action: 'device_bind_confirm', detail: '模拟绑定设备: ' + deviceId, ip: req.ip })
-  res.json(ok({ message: 'success', device_id: deviceId }))
-}))
-
 router.post('/device/unbind', requireUser, wrap(async (req, res) => {
   const deviceId = req.body.device_id || null
   await bindingDao.unbindByUser(req.user.user_id, deviceId)