fix: 更新多云账单同步说明

- 展示当前支持的五个云厂商
- 统一多云出账时效与只读权限提示

frontend/src/locales/en-US.json

@@ -7208,11 +7208,11 @@
     "syncBilling": "Sync Billing",
     "syncBillingFailed": "Billing sync failed",
     "syncBillingHint": "Pull yesterday's bill from cloud accounts with AK configured",
-    "syncBillingInfo": "Sync pulls bills from active cloud accounts (product + region). Aliyun supported now.",
+    "syncBillingInfo": "Sync pulls bills from active cloud accounts by service and region. Aliyun, Tencent Cloud, AWS, Huawei Cloud, and Azure are supported.",
     "syncBillingPartial": "Some accounts failed to sync",
     "syncBillingResult": "{{date}}: {{created}} created, {{updated}} updated",
     "syncBillingSuccess": "Billing sync succeeded",
-    "syncBillingTiming": "Billing latency: Aliyun daily bills are usually T+1 (sync yesterday after 10:00 today). Postpaid hourly products may lag ~1 day. AK needs bss:DescribeBillList.",
+    "syncBillingTiming": "Daily bills are typically available on T+1. Sync yesterday's data after 10:00 and grant read-only billing or cost-management access for the provider.",
     "syncFailed": "Sync failed",
     "syncRegions": "Sync Regions",
     "syncRegionsFailed": "Region sync failed",