Add player controller, state management, and input handling

- Implemented PlayerController.cs to manage player movement and actions.
- Created PlayerState.cs to track player lives, coins, and key status.
- Added CameraFollow.cs for smooth camera movement following the player.
- Developed Character.cs as an abstract class for character behavior.
- Introduced Enums.cs for defining TreasureType and MapElementType.
- Added IDoor interface for door interactions.
- Created InputActions.cs for handling player input actions.
- Implemented MainMenu.cs for basic menu functionality including play and exit options.

Assets/Scripts/Hammer.cs

@@ -2,19 +2,96 @@ using UnityEngine;
 
 public class Hammer : MonoBehaviour
 {
-    private float _life = 3;
+    [SerializeField] private float _lifespan = 5f;
+    [SerializeField] private float _stunDuration = 1f;
+    [SerializeField] private float _impactNoiseRadius = 10f;
+    [SerializeField] private bool _emitNoiseOnImpact = true;
+
+    private float _lifeTimer;
+    private Vector2 _velocity;
+    private bool _facingRight;
+    private Rigidbody2D _rigidbody;
+    private bool _hasCollided = false;
+
     private void Awake()
     {
-        Destroy(gameObject, _life);
+        _rigidbody = GetComponent<Rigidbody2D>();
+        _lifeTimer = _lifespan;
+    }
+
+    public void Initialize(bool facingRight, float speed)
+    {
+        _facingRight = facingRight;
+        _velocity = new Vector2(facingRight ? speed : -speed, 0);
+        
+        if (_rigidbody != null)
+        {
+            _rigidbody.linearVelocity = _velocity;
+        }
+    }
+
+    private void Update()
+    {
+        // Self-destruct after lifespan expires
+        _lifeTimer -= Time.deltaTime;
+        if (_lifeTimer <= 0)
+        {
+            Destroy(gameObject);
+        }
     }
 
     private void OnCollisionEnter2D(Collision2D collision)
     {
+        if (_hasCollided)
+            return;
+
+        _hasCollided = true;
+
+        // Check for enemy collision (stun)
+        var enemy = collision.gameObject.GetComponent<Character>();
+        if (enemy != null)
+        {
+            HandleEnemyCollision(enemy, collision.relativeVelocity);
+            EmitImpactNoise(collision.GetContact(0).point);
+            Destroy(gameObject);
+            return;
+        }
+
+        // Check for breakable wall collision
         var mapElement = collision.collider.GetComponent<MapElement>();
-        if (mapElement != null)
+        if (mapElement != null && mapElement is BreakableWall)
         {
             mapElement.Hit();
+            EmitImpactNoise(collision.GetContact(0).point);
             Destroy(gameObject);
+            return;
+        }
+
+        // Fallback: destroy on any collision
+        EmitImpactNoise(collision.GetContact(0).point);
+        Destroy(gameObject);
+    }
+
+    private void HandleEnemyCollision(Character enemy, Vector2 impactVelocity)
+    {
+        // Apply stun to enemy
+        var enemyAI = enemy as EnemyAI;
+        if (enemyAI != null)
+        {
+            enemyAI.OnHitByHammer(_stunDuration);
+        }
+    }
+
+    private void EmitImpactNoise(Vector2 position)
+    {
+        if (!_emitNoiseOnImpact)
+            return;
+
+        // Check if NoiseSystem exists and emit noise
+        var noiseSystem = NoiseSystem.Instance;
+        if (noiseSystem != null)
+        {
+            noiseSystem.Emit(position, _impactNoiseRadius);
         }
     }
 }