chore: release v1.0.3

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/internal/handler/user.go

@@ -22,7 +22,7 @@ func NewUserHandler(db *gorm.DB) *UserHandler {
 // List GET /api/v1/users
 func (h *UserHandler) List(c *gin.Context) {
 	shopID := middleware.GetShopID(c)
-	var users []model.User
+	users := make([]model.User, 0)
 	h.db.Where("shop_id = ? AND deleted_at IS NULL", shopID).
 		Order("id ASC").Find(&users)
 	c.JSON(http.StatusOK, gin.H{"data": users})