feat(companion): 全面确立以陪吃·陪喝·陪唱为主的核心架构，重构首屏推荐阵容与歌声试听

server/src/core/companion/service-category.ts

@@ -8,6 +8,7 @@ export enum CompanionTrack {
   OFFLINE_PLAY = 'OFFLINE_PLAY',     // 线下同城陪玩 (桌游/剧本杀/运动/漫展)
   OFFLINE_MEAL = 'OFFLINE_MEAL',     // 线下同城陪吃 (网红探店/火锅/餐厅饭搭子)
   OFFLINE_DRINK = 'OFFLINE_DRINK',   // 线下同城陪喝 (咖啡下午茶/茶室清吧)
+  OFFLINE_SING = 'OFFLINE_SING',     // 线下同城陪唱 (量贩KTV/麦霸对唱/音乐Live)
 }
 
 export enum ExpenseBurdenType {
@@ -45,10 +46,11 @@ export class ServiceCategoryManager {
 
   getAllTracks(): CompanionTrack[] {
     return [
-      CompanionTrack.ONLINE_GAME,
-      CompanionTrack.OFFLINE_PLAY,
       CompanionTrack.OFFLINE_MEAL,
       CompanionTrack.OFFLINE_DRINK,
+      CompanionTrack.OFFLINE_SING,
+      CompanionTrack.OFFLINE_PLAY,
+      CompanionTrack.ONLINE_GAME,
     ];
   }