✨ 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.

dto/ratio_sync.go

@@ -1,18 +1,7 @@
 package dto
 
-// UpstreamDTO 提交到后端同步倍率的上游渠道信息
-// Endpoint 可以为空，后端会默认使用 /api/ratio_config
-// BaseURL 必须以 http/https 开头，不要以 / 结尾
-// 例如： https://api.example.com
-// Endpoint: /api/ratio_config
-// 提交示例：
-// {
-//   "name": "openai",
-//   "base_url": "https://api.openai.com",
-//   "endpoint": "/ratio_config"
-// }
-
 type UpstreamDTO struct {
+    ID       int    `json:"id,omitempty"`
     Name     string `json:"name" binding:"required"`
     BaseURL  string `json:"base_url" binding:"required"`
     Endpoint string `json:"endpoint"`
@@ -20,6 +9,7 @@ type UpstreamDTO struct {
 
 type UpstreamRequest struct {
     ChannelIDs []int64 `json:"channel_ids"`
+    Upstreams   []UpstreamDTO `json:"upstreams"`
     Timeout    int     `json:"timeout"`
 }
 
@@ -37,10 +27,9 @@ type TestResult struct {
 type DifferenceItem struct {
     Current   interface{}            `json:"current"`
     Upstreams map[string]interface{} `json:"upstreams"`
+    Confidence map[string]bool       `json:"confidence"`
 }
 
-// SyncableChannel 可同步的渠道信息（base_url 不为空）
-
 type SyncableChannel struct {
     ID      int    `json:"id"`
     Name    string `json:"name"`