🎨 style(go): format entire codebase

- Apply canonical Go formatting to all .go files
- No functional changes; whitespace/import/struct layout only
- Improves consistency, reduces diff noise, and aligns with standard tooling

dto/ratio_sync.go

@@ -1,23 +1,23 @@
 package dto
 
 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"`
+	ID       int    `json:"id,omitempty"`
+	Name     string `json:"name" binding:"required"`
+	BaseURL  string `json:"base_url" binding:"required"`
+	Endpoint string `json:"endpoint"`
 }
 
 type UpstreamRequest struct {
-    ChannelIDs []int64 `json:"channel_ids"`
-    Upstreams   []UpstreamDTO `json:"upstreams"`
-    Timeout    int     `json:"timeout"`
+	ChannelIDs []int64       `json:"channel_ids"`
+	Upstreams  []UpstreamDTO `json:"upstreams"`
+	Timeout    int           `json:"timeout"`
 }
 
 // TestResult 上游测试连通性结果
 type TestResult struct {
-    Name   string `json:"name"`
-    Status string `json:"status"`
-    Error  string `json:"error,omitempty"`
+	Name   string `json:"name"`
+	Status string `json:"status"`
+	Error  string `json:"error,omitempty"`
 }
 
 // DifferenceItem 差异项
@@ -25,14 +25,14 @@ type TestResult struct {
 // Upstreams 为各渠道的上游值，具体数值 / "same" / nil
 
 type DifferenceItem struct {
-    Current   interface{}            `json:"current"`
-    Upstreams map[string]interface{} `json:"upstreams"`
-    Confidence map[string]bool       `json:"confidence"`
+	Current    interface{}            `json:"current"`
+	Upstreams  map[string]interface{} `json:"upstreams"`
+	Confidence map[string]bool        `json:"confidence"`
 }
 
 type SyncableChannel struct {
-    ID      int    `json:"id"`
-    Name    string `json:"name"`
-    BaseURL string `json:"base_url"`
-    Status  int    `json:"status"`
-} 
+	ID      int    `json:"id"`
+	Name    string `json:"name"`
+	BaseURL string `json:"base_url"`
+	Status  int    `json:"status"`
+}