feat: 플레이어 관전 시스템 추가

- PlayerSpectator: 사망한 플레이어가 살아있는 플레이어 관찰
- PlayerCamera: SetTarget/ResetToPlayer/SnapToTarget 메서드 추가
- PlayerMovement: OnEnable/OnDisable에서 입력 액션 관리
- Tab 키로 관전 대상 전환 기능

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Assets/Scripts/Player/PlayerMovement.cs

@@ -75,6 +75,17 @@ namespace Colosseum.Player
             SetSpawnPosition();
 
             // Input Actions 초기화
+            InitializeInputActions();
+
+            // 카메라 설정
+            SetupCamera();
+        }
+
+        /// <summary>
+        /// 입력 액션 초기화
+        /// </summary>
+        private void InitializeInputActions()
+        {
             inputActions = new InputSystem_Actions();
             inputActions.Player.Enable();
 
@@ -84,11 +95,42 @@ namespace Colosseum.Player
 
             // Jump 액션 콜백 등록
             inputActions.Player.Jump.performed += OnJumpPerformed;
-
-            // 카메라 설정
-            SetupCamera();
         }
 
+        /// <summary>
+        /// 입력 액션 해제
+        /// </summary>
+        private void CleanupInputActions()
+        {
+            if (inputActions != null)
+            {
+                inputActions.Player.Move.performed -= OnMovePerformed;
+                inputActions.Player.Move.canceled -= OnMoveCanceled;
+                inputActions.Player.Jump.performed -= OnJumpPerformed;
+                inputActions.Player.Disable();
+            }
+        }
+
+        private void OnDisable()
+        {
+            // 컴포넌트 비활성화 시 입력 해제
+            CleanupInputActions();
+            
+            // 입력 초기화
+            moveInput = Vector2.zero;
+        }
+
+        private void OnEnable()
+        {
+            // 컴포넌트 재활성화 시 입력 다시 등록
+            if (IsOwner && inputActions != null)
+            {
+                inputActions.Player.Enable();
+                inputActions.Player.Move.performed += OnMovePerformed;
+                inputActions.Player.Move.canceled += OnMoveCanceled;
+                inputActions.Player.Jump.performed += OnJumpPerformed;
+            }
+        }
 
         /// <summary>
         /// 스폰 위치 설정
@@ -107,34 +149,24 @@ namespace Colosseum.Player
             }
         }
 
-
         /// <summary>
-        /// 네트워크 정리리
+        /// 네트워크 정리
         /// </summary>
         public override void OnNetworkDespawn()
         {
-            if (inputActions != null)
-            {
-                inputActions.Player.Move.performed -= OnMovePerformed;
-                inputActions.Player.Move.canceled -= OnMoveCanceled;
-                inputActions.Player.Jump.performed -= OnJumpPerformed;
-                inputActions.Disable();
-            }
+            CleanupInputActions();
         }
 
-
         private void OnMovePerformed(InputAction.CallbackContext context)
         {
             moveInput = context.ReadValue<Vector2>();
         }
 
-
         private void OnMoveCanceled(InputAction.CallbackContext context)
         {
             moveInput = Vector2.zero;
         }
 
-
         private void OnJumpPerformed(InputAction.CallbackContext context)
         {
             if (!isJumping && characterController.isGrounded)
@@ -143,7 +175,6 @@ namespace Colosseum.Player
             }
         }
 
-
         private void SetupCamera()
         {
             var cameraController = GetComponent<PlayerCamera>();
@@ -154,6 +185,13 @@ namespace Colosseum.Player
             cameraController.Initialize(transform, inputActions);
         }
 
+        /// <summary>
+        /// 카메라 재설정 (씬 로드 후 호출)
+        /// </summary>
+        public void RefreshCamera()
+        {
+            SetupCamera();
+        }
 
         private void Update()
         {
@@ -163,7 +201,6 @@ namespace Colosseum.Player
             Move();
         }
 
-
         private void ApplyGravity()
         {
             if (wasGrounded && velocity.y < 0)
@@ -176,7 +213,6 @@ namespace Colosseum.Player
             }
         }
 
-
         private void Move()
         {
             if (characterController == null) return;
@@ -218,7 +254,6 @@ namespace Colosseum.Player
             wasGrounded = characterController.isGrounded;
         }
 
-
         private void Jump()
         {
             isJumping = true;
@@ -232,7 +267,6 @@ namespace Colosseum.Player
             }
         }
 
-
         /// <summary>
         /// 점프 중 상태가 끝나면 IsJumping = false;
         /// </summary>
@@ -241,7 +275,6 @@ namespace Colosseum.Player
             isJumping = false;
         }
 
-
         private Vector3 TransformDirectionByCamera(Vector3 direction)
         {
             if (Camera.main == null) return direction;
@@ -259,7 +292,6 @@ namespace Colosseum.Player
             return cameraRight * direction.x + cameraForward * direction.z;
         }
 
-
         /// <summary>
         /// 루트 모션 처리. 스킬 애니메이션 중에 애니메이션의 이동/회전 데이터를 적용합니다.
         /// </summary>