(client) feat:实现子弹定义 chore:将建筑碰撞体改为方形

Client/Assets/Scripts/Entity/Bullet.cs

@@ -0,0 +1,18 @@
+using System;
+using UnityEngine;
+
+namespace Entity
+{
+    public class Bullet:Entity
+    {
+        protected override void AutoBehave()
+        {
+            TryMove();
+        }
+
+        private void OnTriggerEnter2D(Collider2D other)
+        {
+            other.GetComponent<Entity>()?.OnHit(this);
+        }
+    }
+}