fix(api-server): handle QQ Music API export differences across versions

The @sansenjian/qq-music-api module's export structure varies between
versions (2.2.10 vs 2.2.11+). Add fallback chain to find the Koa app:
try candidate.listen first, then candidate.default.listen.

Also resolve leftover merge conflict marker in instance.ts.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/bot/instance.ts

@@ -61,11 +61,9 @@ export class BotInstance extends EventEmitter {
   private disconnectEmitted = false;
   private voteSkipUsers = new Set<string>();
   private isAdvancing = false;
-<<<<<<< HEAD
   private idleTimer: ReturnType<typeof setTimeout> | null = null;
   private channelUserCount = 0;
   private profileManager: BotProfileManager;
->>>>>>> origin/main
 
   constructor(options: BotInstanceOptions) {
     super();