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/history/history.js

@@ -54,7 +54,7 @@ Page({
         r.duration_text = durationMin + '分钟'
         r.region_names = ble.getRegionName(r.regions || 0).join('、')
         r.wavelength_name = ble.getWavelengthName(r.wavelength || 2)
-        r.date_text = self.formatDate(r.start_time)
+        r.date_text = self.formatDate(r.start_time || r.created_at)
 
         if (r.start_time && new Date(r.start_time) >= monthStart) {
           monthCount++