feat: 입고 PDA UI (UI Toolkit) — 보류 작업물 정리

캐릭터-first 전환 전에 만든 PDA/창고 UI 작업물을 히스토리에 보존.
- InboundPda.uxml/.uss/.tss + InboundPanelSettings
- InboundUIController: 단계별 렌더링 + 입력 위임
- InboundSceneSetup: UIDocument/PanelSettings 자동 와이어링
씬에는 비활성 상태로 존재. 추후 입고 로직 재연결 시 재사용 가능.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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