[Fix] - equipmentUI 부분 오류 수정

[movingfrog]

개요

장비 UI 부분에 있던 오류를 수정하였습니다

수정 사항

• EqupmentManager와 EventSystem 삭제 및 EquipmentManager를 Prefab화
• 불필요한 RacastTarget설정 해제

[gemini-code-assist]

Code Review

This pull request introduces several UI and manager updates, including the addition of the EquipManager prefab, adjustments to skill ranges in asset files, and robust binding of EquipmentManager to GameManager to handle player changes. It also adds defensive null checks and initialization logic in UI slot scripts (SelectSlot.cs, Slot.cs) to prevent runtime errors. The review feedback highlights a potential memory leak in EquipmentManager.cs due to Unity's overloaded == operator on destroyed objects, suggesting the use of ReferenceEquals. Additionally, it recommends moving icon assignment in Slot.cs to RefreshIcon() to avoid initialization order issues, and points out a redundant null check in EquipmentManager.cs.

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