feat(admin,player,api): 公共管理与优胜冠军国旗、玩家端内容对接

新增公共内容 CRUD 与批量操作；公告滚动合并管理；优胜冠军内置国家选择与单行保存；玩家端统一 usePlayerHome 对接轮播与跑马灯。

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/player/src/constants/defaultBanner.ts

@@ -29,6 +29,8 @@ export function resolveBanners(banners: BannerItem[] | undefined | null): Banner
     },
   }));
 
+  if (fromApi.length > 0) return fromApi;
+
   const defaultSlide: BannerItem = {
     ...DEFAULT_BANNER,
     translation: {
@@ -37,5 +39,5 @@ export function resolveBanners(banners: BannerItem[] | undefined | null): Banner
     },
   };
 
-  return [defaultSlide, ...fromApi];
+  return [defaultSlide];
 }