fix: 修复502导致的内存泄漏问题

internal/backend/forwarder/json_helpers.go

@@ -10,21 +10,6 @@ import (
 	modeladapter "cursor/internal/backend/agent/model"
 )
 
-func cloneStringAnyMap(value map[string]any) map[string]any {
-	if len(value) == 0 {
-		return nil
-	}
-	payload, err := json.Marshal(value)
-	if err != nil {
-		return nil
-	}
-	var decoded map[string]any
-	if err := json.Unmarshal(payload, &decoded); err != nil {
-		return nil
-	}
-	return decoded
-}
-
 func parseRFC3339Time(value string) time.Time {
 	trimmed := strings.TrimSpace(value)
 	if trimmed == "" {