sync: bring over remaining release/custom-0.1.115 changes

- Extract PublicSettingsInjectionPayload named struct with drift test
- Add channel_monitor_default_interval_seconds to SSR injection
- Add image_output_price to SupportedModelChip
- Simplify AppSidebar buildSelfNavItems (admins see available channels)
- Add gateway WARN logs for 503 no-available-accounts branches
- Wire ChannelMonitorRunner into provideCleanup for graceful shutdown
- Add migrations 130/131 (CC template userid fix + mimicry field cleanup)
- Clean up fork-only features (sora, claude max simulation, client affinity)
- Remove ~320 obsolete i18n keys
- Add codexUsage utility, WechatServiceButton, BulkEditAccountModal
- Tidy go.sum

frontend/src/components/payment/PaymentStatusPanel.vue

@@ -84,9 +84,6 @@
             </div>
           </div>
           <p v-if="scanHint" class="text-center text-sm text-gray-500 dark:text-gray-400">{{ scanHint }}</p>
-          <button v-if="payUrl" class="btn btn-secondary text-sm" @click="reopenPopup">
-            {{ t('payment.qr.openPayWindow') }}
-          </button>
         </div>
       </div>
       <div class="card p-4 text-center">