chore: release v1.0.3

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

backend/internal/handler/number_rule.go

@@ -32,7 +32,7 @@ var defaultRules = []struct {
 // List GET /api/v1/number-rules
 func (h *NumberRuleHandler) List(c *gin.Context) {
 	shopID := middleware.GetShopID(c)
-	var rules []model.NumberRule
+	rules := make([]model.NumberRule, 0)
 	h.db.Where("shop_id = ?", shopID).Order("id").Find(&rules)
 
 	if len(rules) == 0 {