feat: 참가자 잠금 기능 추가 및 관리자 상태 조회 기능 구현

app/game-api/src/tournament/types.ts

@@ -14,6 +14,7 @@ export interface TournamentState {
     winnerId?: number;
     bettingSettled?: boolean;
     rewardSettled?: boolean;
+    participantsLockedAt?: string;
     lastError?: string;
     lastErrorAt?: string;
 }

app/game-api/src/tournament/worker.ts

@@ -330,6 +330,7 @@ const applyPreBattleStage = async (
             ...state,
             stage: 2,
             phase: 0,
+            participantsLockedAt: new Date().toISOString(),
             nextAt: resolveNextAt(state),
         };
         await store.setState(nextState);