feat(log): 全面重构日志系统，支持日志级别、去除ANSI乱码并抑制高频轮询

backend/internal/middleware/open_auth.go

@@ -151,7 +151,7 @@ func OpenAuth(cfg OpenAuthConfig) gin.HandlerFunc {
 		c.Set(openlog.CtxAPIKey, appKey)
 		_ = cfg.DB.Model(&model.APIClient{}).Where("id = ?", client.ID).Update("last_used_at", now).Error
 
-		openlog.Info(c, "open_auth ok app_key=%s merchant_id=%d method=%s path=%s body_size=%d",
+		openlog.Debug(c, "open_auth ok app_key=%s merchant_id=%d method=%s path=%s body_size=%d",
 			openlog.MaskKey(appKey), client.MerchantID, method, path, len(bodyBytes))
 		c.Next()
 	}