fix: resolve multiple miniprogram bugs and extend admin console

- fix manual bind stuck at BLE scan, redirect to bind-success
- add 15s timeout and stopScan to ble-connect
- add stopScan method to ble.js
- add back-to-home button on bind-success page
- fix field name in subscribe-plans (plan -> plan_type)
- fix history.js to handle created_at field
- fix index.js to handle device name field
- add subscription route alias in request.js
- extend admin cloud function from 1 to 9 actions
- add mock mode to admin-console request.js
- remove unused discover page and legacy record function

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

miniprogram/pages/bind-success/bind-success.wxml

@@ -19,5 +19,6 @@
     </view>
 
     <button class="btn-primary" bindtap="onStart">开始使用</button>
+    <button class="btn-secondary" bindtap="onGoHome">返回首页</button>
   </view>
 </view>