Go: Refactor list-models func (#15900)

### What problem does this PR solve?

As title
Issue: #15853 

### Type of change

- [x] Refactoring

internal/entity/models/astraflow.go

@@ -363,33 +363,16 @@ func (a *AstraflowModel) ListModels(apiConfig *APIConfig) ([]ListModelResponse,
 		return nil, fmt.Errorf("API request failed with status %d: %s", resp.StatusCode, string(body))
 	}
 
-	var result map[string]interface{}
-	if err = json.Unmarshal(body, &result); err != nil {
+	// Parse response
+	var modelList ModelList
+	if err = json.Unmarshal(body, &modelList); err != nil {
 		return nil, fmt.Errorf("failed to parse response: %w", err)
 	}
-
-	data, ok := result["data"].([]interface{})
-	if !ok {
+	if modelList.Models == nil {
 		return nil, fmt.Errorf("invalid models list format")
 	}
 
-	models := make([]ListModelResponse, 0, len(data))
-	var modelMap map[string]interface{}
-	for _, m := range data {
-		modelMap, ok = m.(map[string]interface{})
-		if !ok {
-			continue
-		}
-		var id string
-		id, ok = modelMap["id"].(string)
-		if !ok {
-			continue
-		}
-		models = append(models, ListModelResponse{
-			Name: id,
-		})
-	}
-	return models, nil
+	return ParseListModel(modelList), nil
 }
 
 func (a *AstraflowModel) CheckConnection(apiConfig *APIConfig) error {