feat: add shipping template management and update favicon

backend/internal/api/handlers/product.go

@@ -225,7 +225,7 @@ func (h *ProductHandler) GetByID(c *gin.Context) {
 
 func (h *ProductHandler) AdminList(c *gin.Context) {
 	var products []models.Product
-	utils.DB.Preload("Categories").Preload("Brand").Order("created_at DESC").Find(&products)
+	utils.DB.Preload("Categories").Preload("Brand").Preload("ShippingTemplate").Order("created_at DESC").Find(&products)
 	c.JSON(http.StatusOK, gin.H{"data": products})
 }
 
@@ -237,22 +237,23 @@ func (h *ProductHandler) Create(c *gin.Context) {
 	}
 
 	product := models.Product{
-		Name:          req.Name,
-		Description:   req.Description,
-		Price:         req.Price,
-		Weight:        req.Weight,
-		MinPurchase:   req.MinPurchase,
-		MaxPurchase:   req.MaxPurchase,
-		MinWeight:     req.MinWeight,
-		MaxWeight:     req.MaxWeight,
-		MinAmount:     req.MinAmount,
-		MaxAmount:     req.MaxAmount,
-		RequireCredit: req.RequireCredit,
-		CreditCost:    req.CreditCost,
-		CreditReward:  req.CreditReward,
-		Images:        req.Images,
-		BrandID:       req.BrandID,
-		IsActive:      true,
+		Name:              req.Name,
+		Description:       req.Description,
+		Price:             req.Price,
+		Weight:            req.Weight,
+		MinPurchase:       req.MinPurchase,
+		MaxPurchase:       req.MaxPurchase,
+		MinWeight:         req.MinWeight,
+		MaxWeight:         req.MaxWeight,
+		MinAmount:         req.MinAmount,
+		MaxAmount:         req.MaxAmount,
+		RequireCredit:     req.RequireCredit,
+		CreditCost:        req.CreditCost,
+		CreditReward:      req.CreditReward,
+		Images:            req.Images,
+		BrandID:           req.BrandID,
+		ShippingTemplateID: req.ShippingTemplateID,
+		IsActive:          true,
 	}
 
 	if err := utils.DB.Create(&product).Error; err != nil {
@@ -276,7 +277,7 @@ func (h *ProductHandler) Create(c *gin.Context) {
 		}
 	}
 
-	utils.DB.Preload("Categories").Preload("CustomFields").Preload("Brand").First(&product, product.ID)
+	utils.DB.Preload("Categories").Preload("CustomFields").Preload("Brand").Preload("ShippingTemplate").First(&product, product.ID)
 	c.JSON(http.StatusCreated, gin.H{"data": product})
 }
 
@@ -343,6 +344,9 @@ func (h *ProductHandler) Update(c *gin.Context) {
 	if req.BrandID != nil {
 		updates["brand_id"] = *req.BrandID
 	}
+	if req.ShippingTemplateID != nil {
+		updates["shipping_template_id"] = *req.ShippingTemplateID
+	}
 
 	utils.DB.Model(&product).Updates(updates)
 
@@ -363,7 +367,7 @@ func (h *ProductHandler) Update(c *gin.Context) {
 		}
 	}
 
-	utils.DB.Preload("Categories").Preload("CustomFields").Preload("Brand").First(&product, product.ID)
+	utils.DB.Preload("Categories").Preload("CustomFields").Preload("Brand").Preload("ShippingTemplate").First(&product, product.ID)
 	c.JSON(http.StatusOK, gin.H{"data": product})
 }