chore: release server-v1.0.74

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YZ4DskSRKsSiheQonFtQvx

backend/internal/handler/stock_in.go

@@ -1,6 +1,7 @@
 package handler
 
 import (
+	"errors"
 	"fmt"
 	"net/http"
 	"strconv"
@@ -283,3 +284,33 @@ func (h *StockInHandler) Withdraw(c *gin.Context) {
 		Update("status", "draft")
 	c.JSON(http.StatusOK, gin.H{"message": "withdrawn"})
 }
+
+// Return POST /api/v1/stock-in/orders/:id/return
+// 入库退单：退掉指定明细，对应库存从库存删除、冲减应付。仅 approved 单、管理员/超管。
+func (h *StockInHandler) Return(c *gin.Context) {
+	shopID := middleware.GetShopID(c)
+	userID := middleware.GetUserID(c)
+	role := middleware.GetRole(c)
+	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
+
+	var req struct {
+		ItemIDs []uint64 `json:"item_ids"`
+	}
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	if len(req.ItemIDs) == 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "未选择退单明细"})
+		return
+	}
+	if err := h.stockSvc.ReturnStockIn(shopID, id, userID, role, req.ItemIDs); err != nil {
+		if errors.Is(err, service.ErrForbidden) {
+			c.JSON(http.StatusForbidden, gin.H{"error": "无权退单"})
+			return
+		}
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"message": "returned"})
+}