优化商品展示：固定封面、正确编号与价格、租期与复制信息

使用固定商品图避免远程图加载慢；编号改为 listing_no；价格按 price_cent 换算；去掉 Hero 横幅；公告仅一条滚动；展示租期；区分复制编号与复制完整信息。

src/api.ts

@@ -14,6 +14,7 @@ export interface ListingResource {
 
 export interface Listing {
   id: number;
+  listing_no?: string;
   title: string;
   description: string;
   game_name: string;
@@ -24,8 +25,12 @@ export interface Listing {
   asset_summary?: Record<string, unknown>;
   screenshot_urls: string[];
   cover_url: string;
-  price: number;
-  deposit_amount: number;
+  price_cent: number;
+  deposit_amount_cent: number;
+  /** @deprecated 兼容旧字段，优先使用 price_cent */
+  price?: number;
+  /** @deprecated 兼容旧字段，优先使用 deposit_amount_cent */
+  deposit_amount?: number;
   is_accelerated_sale?: boolean;
   in_transaction: boolean;
   published_at?: string;