Add initial game systems and input handling for player interactions

Assets/Scripts/Core/Systems/PersistenceSystem.cs

@@ -0,0 +1,46 @@
+using System;
+using Infrastructure;
+
+namespace Core.Systems
+{
+    public class PersistenceSystem : IDisposable
+    {
+        private readonly IPersistenceService _service;
+        private readonly string _saveKey;
+        private int _currentRunScore;
+        
+        public PersistenceSystem(IPersistenceService service, string saveKey)
+        {
+            _service = service;
+            _saveKey = saveKey;
+            
+            GameEvents.ScoreUpdated += OnScoreUpdated;
+            GameEvents.GameOver += OnGameOver;
+        }
+
+        public int GetHighScore()
+        {
+            return _service.LoadHighScore(_saveKey);
+        }
+
+        private void OnGameOver()
+        {
+            var existingHighScore = _service.LoadHighScore(_saveKey);
+            if (_currentRunScore > existingHighScore)
+            {
+                _service.SaveHighScore(_saveKey, _currentRunScore);
+            }
+        }
+
+        private void OnScoreUpdated(int newScore)
+        {
+            _currentRunScore = newScore;
+        }
+
+        public void Dispose()
+        {
+            GameEvents.ScoreUpdated -= OnScoreUpdated;
+            GameEvents.GameOver -= OnGameOver;
+        }
+    }
+}