feat: 빈사/부활 시스템 및 ReviveEffect 추가

- PlayerNetworkController에 Revive(healthPercent) 메서드와 OnRevived 이벤트 추가

- ReviveEffect 스킬 이펙트 구현 (Area/Ally 타겟팅, healthPercent로 체력 복구)

- GameManager가 OnRevived 구독하여 alivePlayers 동적 복구

- GameManager.Update에서 나중에 스폰된 플레이어 자동 구독 (MPP 대응)

- SkillCancelReason에 Revive 추가

- 부활 스킬/이펙트 ScriptableObject 에셋 생성 (치유 클립 임시 사용)

- PlayerSkillDebugMenu에 즉사/부활/리스폰/스폰/Client1 스킬 디버그 메뉴 추가

- PlayerAbnormalityDebugHUD에 부활 버튼 추가

- DebugExecuteSkillAsServer에 실패 원인 로그 추가

- AGENTS.md에 코드 변경 후 force reload 규칙 추가

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