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/pages/login/login.vue

@@ -300,7 +300,6 @@ const doWxLogin = async () => {
   wxLoading.value = true
   try {
     const wxResp = await uni.login()
-    console.log('[wxLogin] uni.login success:', JSON.stringify(wxResp).slice(0, 300))
     const { code, errMsg } = wxResp
     if (!code) { console.error('[wxLogin] no code:', errMsg); showToast('获取微信凭证失败'); return }
     const res = await uni.request({
@@ -308,7 +307,6 @@ const doWxLogin = async () => {
       header: { 'Content-Type': 'application/json' },
       data: { code },
     })
-    console.log('[wxLogin] server response:', res.statusCode, JSON.stringify(res.data).slice(0, 500))
     if (res.statusCode === 200 && res.data?.token) {
       loginSuccess(res.data)
     } else {