feat: backend-core v26.8.0 프론트 마이그레이션

[aryu1217]

요약

• 큐 조회를 첫 페이지 + cursor/queueRevision 기반 infinite pagination으로 전환했습니다.
• ownerOrderLocked, 공개 식별자, room.access-denied, strict join event, thumbnail 계약을 반영했습니다.
• user.session-replaced 시 해당 방 연결의 재접속만 중단하고 follow presence 연결은 유지합니다.
• 특정 계정 방 입장 장애를 프론트 회귀로 오인한 진단과 임시 우회 흔적을 정정했습니다.

검증

• npm run test (42 files / 100 tests)
• npm run lint
• npm run build
• fresh read-only QA: pass

의존성

• stacked PR이며 base는 feat/backend-core-v26-7-1 (PR feat: backend-core v26.7.1 프론트 계약 마이그레이션 #28)입니다.
• 실제 backend 다중 창 session replacement E2E는 v26.8 환경에서 수동 확인이 필요합니다.

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Project	Deployment	Actions	Updated (UTC)
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