chore: Assets 디렉토리 구조 정리 및 네이밍 컨벤션 적용

- Assets/_Game/ 하위로 게임 에셋 통합
- External/ 패키지 벤더별 분류 (Synty, Animations, UI)
- 에셋 네이밍 컨벤션 확립 및 적용
  (Data_Skill_, Data_SkillEffect_, Prefab_, Anim_, Model_, BT_ 등)
- pre-commit hook으로 네이밍 컨벤션 자동 검사 추가
- RESTRUCTURE_CHECKLIST.md 작성

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Assets/_Game/Scripts/UI/PlayerHUD.cs

@@ -0,0 +1,121 @@
+using System;
+using UnityEngine;
+using Colosseum.Player;
+
+namespace Colosseum.UI
+{
+    /// <summary>
+    /// 플레이어 HUD - 체력/마나 바 관리
+    /// </summary>
+    public class PlayerHUD : MonoBehaviour
+    {
+        [Header("Stat Bars")]
+        [SerializeField] private StatBar healthBar;
+        [SerializeField] private StatBar manaBar;
+
+        [Header("Target")]
+        [Tooltip("자동으로 로컬 플레이어 찾기")]
+        [SerializeField] private bool autoFindPlayer = true;
+
+        private PlayerNetworkController targetPlayer;
+
+        private void Start()
+        {
+            if (autoFindPlayer)
+            {
+                FindLocalPlayer();
+            }
+        }
+
+        private void Update()
+        {
+            // 플레이어가 아직 없으면 계속 찾기
+            if (targetPlayer == null && autoFindPlayer)
+            {
+                FindLocalPlayer();
+            }
+        }
+
+        private void OnDestroy()
+        {
+            // 이벤트 구독 해제
+            UnsubscribeFromEvents();
+        }
+
+        private void FindLocalPlayer()
+        {
+            foreach (var player in FindObjectsByType<PlayerNetworkController>(FindObjectsSortMode.None))
+            {
+                if (player.IsOwner)
+                {
+                    SetTarget(player);
+                    break;
+                }
+            }
+        }
+
+        /// <summary>
+        /// 추적할 플레이어 설정
+        /// </summary>
+        public void SetTarget(PlayerNetworkController player)
+        {
+            // 이전 타겟 구독 해제
+            UnsubscribeFromEvents();
+
+            targetPlayer = player;
+
+            // 새 타겟 구독
+            SubscribeToEvents();
+
+            // 초기 값 설정
+            UpdateStatBars();
+        }
+
+        private void SubscribeToEvents()
+        {
+            if (targetPlayer == null) return;
+
+            targetPlayer.OnHealthChanged += HandleHealthChanged;
+            targetPlayer.OnManaChanged += HandleManaChanged;
+        }
+
+        private void UnsubscribeFromEvents()
+        {
+            if (targetPlayer == null) return;
+
+            targetPlayer.OnHealthChanged -= HandleHealthChanged;
+            targetPlayer.OnManaChanged -= HandleManaChanged;
+        }
+
+        private void HandleHealthChanged(float oldValue, float newValue)
+        {
+            if (healthBar != null && targetPlayer != null)
+            {
+                healthBar.SetValue(newValue, targetPlayer.MaxHealth);
+            }
+        }
+
+        private void HandleManaChanged(float oldValue, float newValue)
+        {
+            if (manaBar != null && targetPlayer != null)
+            {
+                manaBar.SetValue(newValue, targetPlayer.MaxMana);
+            }
+        }
+
+        private void UpdateStatBars()
+        {
+            if (targetPlayer == null) return;
+
+            if (healthBar != null)
+            {
+                healthBar.SetValue(targetPlayer.Health, targetPlayer.MaxHealth);
+            }
+
+            if (manaBar != null)
+            {
+                manaBar.SetValue(targetPlayer.Mana, targetPlayer.MaxMana);
+            }
+        }
+    }
+}