feat(models): 模型目录与计费 - 按展示名分组并隔离管理员积分成本

backend/internal/handler/admin_channel_model_response.go

@@ -0,0 +1,22 @@
+package handler
+
+import "infinite-canvas/backend/internal/model"
+
+// 成本字段只在已通过 service 管理员校验的模型编辑接口中显式投影。
+type adminChannelModelPriceTier struct {
+	model.ChannelModelPriceTier
+	CostPricing model.CreditCostPricing `json:"costPricing"`
+}
+
+type adminChannelModelResponse struct {
+	model.ChannelModel
+	PriceTiers []adminChannelModelPriceTier `json:"priceTiers"`
+}
+
+func adminChannelModel(item model.ChannelModel) adminChannelModelResponse {
+	tiers := make([]adminChannelModelPriceTier, 0, len(item.PriceTiers))
+	for _, tier := range item.PriceTiers {
+		tiers = append(tiers, adminChannelModelPriceTier{ChannelModelPriceTier: tier, CostPricing: tier.CostPricing})
+	}
+	return adminChannelModelResponse{ChannelModel: item, PriceTiers: tiers}
+}