重构日志与可观测性体系

新增单行文本编码器与结构化 GORM 日志，统一错误记录与请求日志策略，收紧日志文件权限并修复按天切分与压缩，支付回调参数脱敏，生产强制阿里云短信，RequestID 校验防注入，日志文案中文化。

backend/internal/modules/order/refund.go

@@ -2,9 +2,11 @@ package order
 
 import (
 	"context"
-	"log"
 
+	"hfb_sys/backend/internal/logging"
 	"hfb_sys/backend/internal/model"
+
+	"go.uber.org/zap"
 )
 
 func (r *Repository) prepareRefund(order *model.RentalOrder, amountCent int64, bizType string, remark string) (*refundAction, error) {
@@ -30,6 +32,12 @@ func (r *Repository) startRefundBestEffort(ctx context.Context, action *refundAc
 		return
 	}
 	if _, err := r.refundStarter.StartRefund(ctx, action.OrderID, action.RefundAmountCent, action.BizType, action.Remark); err != nil {
-		log.Printf("[order] start refund failed order_id=%d biz_type=%s amount_cent=%d err=%v", action.OrderID, action.BizType, action.RefundAmountCent, err)
+		logging.FromContext(ctx).Error("订单退款提交失败",
+			zap.String("module", "order"),
+			zap.Uint64("order_id", action.OrderID),
+			zap.String("biz_type", action.BizType),
+			zap.Int64("amount_cent", action.RefundAmountCent),
+			zap.Error(err),
+		)
 	}
 }