✨ feat(ratio-sync): support /api/pricing parsing, confidence verification & UI enhancements

Backend
- controller/ratio_sync.go
  • Parse /api/pricing response and convert to ratio / price maps.
  • Introduce confidence heuristic (model_ratio = 37.5 && completion_ratio = 1) to flag unreliable data.
  • Include confidence map when building differences and filter “same”/empty entries.
- dto/ratio_sync.go
  • Add `ID` to UpstreamDTO, `upstreams` to UpstreamRequest, and `Confidence` to DifferenceItem.

Frontend
- ChannelSelectorModal.js
  • Re-implement with table layout, pagination, search, endpoint-type selector and mobile support.
- UpstreamRatioSync.js
  • Send full upstream objects, add ratio-type filter, confidence badges/tooltips, retain endpoints.
  • Leverage ChannelSelectorModal’s pagination reset.
- ChannelsTable.js – fix tag color for disabled status.
- en.json – add translations for new UI labels.

Motivation
These changes let users sync model ratios / prices from different upstream endpoints and visually identify potentially unreliable data, improving operational safety and flexibility.

web/src/i18n/locales/en.json

@@ -1701,5 +1701,14 @@
   "充值分组倍率": "Recharge group ratio",
   "充值方式设置": "Recharge method settings",
   "更新支付设置": "Update payment settings",
-  "通知": "Notice"
+  "通知": "Notice",
+  "源地址": "Source address",
+  "同步接口": "Synchronization interface",
+  "置信度": "Confidence",
+  "谨慎": "Cautious",
+  "该数据可能不可信，请谨慎使用": "This data may not be reliable, please use with caution",
+  "可信": "Reliable",
+  "所有上游数据均可信": "All upstream data is reliable",
+  "以下上游数据可能不可信：": "The following upstream data may not be reliable: ",
+  "按倍率类型筛选": "Filter by ratio type"
 }