(client) feat:Add Singleton and MonoSingleton class

Client/Assets/Scripts/Utils.meta

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+fileFormatVersion: 2
+guid: 44fba140ed5941d3999e1ff66685b176
+timeCreated: 1752049808

Client/Assets/Scripts/Utils/MonoSingleton.cs

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+using UnityEngine;
+
+namespace Utils
+{
+    public abstract class MonoSingleton<T> : MonoBehaviour where T : MonoBehaviour
+    {
+        private static T _instance;
+        public bool isGlobal = true;
+
+        public static T Instance => _instance ??= FindFirstObjectByType<T>();
+
+        private void Awake()
+        {
+            Debug.LogWarning($"{typeof(T)} [{GetInstanceID()}] Awake");
+            if (isGlobal)
+            {
+                if (_instance is not null && _instance != gameObject.GetComponent<T>())
+                {
+                    Destroy(gameObject);
+                    return;
+                }
+
+                DontDestroyOnLoad(gameObject);
+                _instance = gameObject.GetComponent<T>();
+            }
+
+            OnStart();
+        }
+
+        protected abstract void OnStart();
+    }
+}

Client/Assets/Scripts/Utils/MonoSingleton.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 9abe30aefbadea24b9a23da5020a413c

Client/Assets/Scripts/Utils/Singleton.cs

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+namespace Utils
+{
+    public class Singleton<T> where T : new()
+    {
+        private static T _instance;
+        public static T Instance => _instance ??= new T();
+    }
+}

Client/Assets/Scripts/Utils/Singleton.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 0937f7a41cd612b4aae1f33f9c1d938a