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/utils/api.js

@@ -13,7 +13,6 @@ module.exports = {
   getDevices: function () { return http.get('/api/v1/device/list') },
   bindDevice: function (deviceId) { return http.post('/api/v1/device/bind', { device_id: deviceId }) },
   confirmBind: function (deviceId, token) { return http.post('/api/v1/device/bind/confirm', { device_id: deviceId, bind_token: token }) },
-  mockBind: function (deviceId) { return http.post('/api/v1/device/mock-bind', { device_id: deviceId }) },
   unbindDevice: function (deviceId) { return http.post('/api/v1/device/unbind', deviceId ? { device_id: deviceId } : {}) },
 
   // Subscription
@@ -21,7 +20,6 @@ module.exports = {
   getSubscription: function () { return http.get('/api/v1/subscription') },
   activateTrial: function () { return http.post('/api/v1/subscription/trial') },
   purchase: function (plan) { return http.post('/api/v1/subscription/purchase', { plan: plan }) },
-  mockPurchase: function (plan) { return http.post('/api/v1/subscription/mock-purchase', { plan: plan }) },
 
   // Payment
   getPaymentOrder: function (orderId) { return http.get('/api/v1/payment/orders/' + orderId) },