chore: production cleanup - remove debug logs, add DB cleanup script

- App.vue: remove console.log on launch/show/hide, drop unused onShow/onHide imports
- interview.vue: remove verbose console.log('[ASR] upload response')
- login.vue: remove debug console.log('[wxLogin]') logs (keep error logs)
- scripts/cleanup-test-data.ts: new script to identify and remove test data
  while preserving admin accounts; supports --dry-run preview mode
- All 43 backend tests pass

zhiyin-app/src/App.vue

@@ -1,8 +1,7 @@
 <script setup lang="ts">
-import { onLaunch, onShow, onHide } from '@dcloudio/uni-app'
+import { onLaunch } from '@dcloudio/uni-app'
 
 onLaunch(() => {
-  console.log('职引 App launched')
   // #ifdef MP-WEIXIN
   initPrivacy()
   // #endif
@@ -49,8 +48,6 @@ function initPrivacy() {
   }
 }
 // #endif
-onShow(() => { console.log('职引 App shown') })
-onHide(() => { console.log('职引 App hidden') })
 </script>
 
 <style>