feat: 탑다운 캐릭터 이동 플레이그라운드

- PlayerController: WASD/방향키 이동 + 진행방향 회전 (새 Input System)
- CameraFollow: 위에서 비스듬히 따라가는 카메라
- PlaygroundSetup: 바닥+캐릭터+카메라 자동 구성 메뉴

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

Assets/Scripts/Player/CameraFollow.cs

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+using UnityEngine;
+
+namespace SinoWms.Player
+{
+    /// <summary>대상(캐릭터)을 위에서 비스듬히 따라다니는 탑다운 카메라.</summary>
+    public class CameraFollow : MonoBehaviour
+    {
+        [SerializeField] private Transform target;
+        [SerializeField] private Vector3 offset = new Vector3(0f, 12f, -8f);
+        [SerializeField] private float smooth = 8f;
+
+        public void SetTarget(Transform t) => target = t;
+
+        private void LateUpdate()
+        {
+            if (target == null) return;
+
+            Vector3 desired = target.position + offset;
+            transform.position = Vector3.Lerp(transform.position, desired, smooth * Time.deltaTime);
+            transform.LookAt(target.position);
+        }
+    }
+}

Assets/Scripts/Player/CameraFollow.cs.meta

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+fileFormatVersion: 2
+guid: 378ab13c02a4c4074878e994d1593434

Assets/Scripts/Player/PlayerController.cs

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+using UnityEngine;
+using UnityEngine.InputSystem;
+
+namespace SinoWms.Player
+{
+    /// <summary>
+    /// 탑다운 캐릭터 이동. 새 Input System(Keyboard.current)으로 WASD/방향키 입력을 받아
+    /// XZ 평면을 이동하고, 진행 방향으로 부드럽게 회전한다.
+    /// </summary>
+    [RequireComponent(typeof(CharacterController))]
+    public class PlayerController : MonoBehaviour
+    {
+        [SerializeField] private float moveSpeed = 5f;
+        [SerializeField] private float turnSpeed = 12f;
+        [SerializeField] private float gravity = -20f;
+
+        private CharacterController _cc;
+        private float _verticalVelocity;
+
+        private void Awake()
+        {
+            _cc = GetComponent<CharacterController>();
+        }
+
+        private void Update()
+        {
+            var kb = Keyboard.current;
+            if (kb == null) return;
+
+            Vector2 input = Vector2.zero;
+            if (kb.wKey.isPressed || kb.upArrowKey.isPressed) input.y += 1f;
+            if (kb.sKey.isPressed || kb.downArrowKey.isPressed) input.y -= 1f;
+            if (kb.dKey.isPressed || kb.rightArrowKey.isPressed) input.x += 1f;
+            if (kb.aKey.isPressed || kb.leftArrowKey.isPressed) input.x -= 1f;
+
+            Vector3 move = new Vector3(input.x, 0f, input.y);
+            if (move.sqrMagnitude > 1f) move.Normalize();
+
+            // 중력 (바닥에 붙어있게)
+            if (_cc.isGrounded && _verticalVelocity < 0f) _verticalVelocity = -2f;
+            _verticalVelocity += gravity * Time.deltaTime;
+
+            Vector3 velocity = move * moveSpeed;
+            velocity.y = _verticalVelocity;
+            _cc.Move(velocity * Time.deltaTime);
+
+            // 진행 방향으로 회전
+            if (move.sqrMagnitude > 0.01f)
+            {
+                Quaternion target = Quaternion.LookRotation(move, Vector3.up);
+                transform.rotation = Quaternion.Slerp(transform.rotation, target, turnSpeed * Time.deltaTime);
+            }
+        }
+    }
+}

Assets/Scripts/Player/PlayerController.cs.meta

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+fileFormatVersion: 2
+guid: 00269464ac30a416992064182bd7186c