(client) feat:实现热重载，实现多维度，实现武器，实现掉落物，实现状态UI，实现攻击AI (#44)

Co-authored-by: zzdxxz <2079238449@qq.com>
Co-committed-by: zzdxxz <2079238449@qq.com>

Client/Assets/Scripts/Entity/Pickup.cs

@@ -0,0 +1,70 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Base;
+using Data;
+using Item;
+using Prefab;
+using UnityEngine;
+
+namespace Entity
+{
+    public class Pickup:Entity
+    {
+        public ItemResource itemResource;
+        protected override void AutoBehave()
+        {
+        }
+
+        public override void SetTarget(Vector3 pos)
+        {
+            
+        }
+
+        public void Init(ItemDef itemDef)
+        {
+            itemResource = Managers.ItemResourceManager.Instance.GetItem(itemDef.defName);
+            // 预缓存枚举值（避免每次循环重复调用 Enum.GetValues）
+            var states = Enum.GetValues(typeof(EntityState)).Cast<EntityState>().ToArray();
+            // 预初始化字典结构（减少内层循环的字典检查）
+            foreach (var state in states)
+            {
+                bodyNodes.TryAdd(state, new Dictionary<Orientation, GameObject>());
+                bodyAnimationNode.TryAdd(state, new Dictionary<Orientation, ITick[]>());
+            }
+
+            var texture = itemResource.Icon;
+            if (texture.Count == 1)
+            {
+                var imageObj = Instantiate(imagePrefab.gameObject, body.transform);
+                imageObj.transform.localPosition = Vector3.zero;
+                bodyNodes[EntityState.Idle][Orientation.Down] = imageObj;
+                var image = imageObj.GetComponent<ImagePrefab>();
+                image.SetSprite(texture[0]);
+            }
+            else if (texture.Count > 1)
+            {
+                var animatorObj = Instantiate(animatorPrefab.gameObject, body.transform);
+                animatorObj.transform.localPosition = Vector3.zero;
+                bodyNodes[EntityState.Idle][Orientation.Down] = animatorObj;
+                var animator = animatorObj.GetComponent<SpriteAnimator>();
+                animator.SetSprites(texture.ToArray());
+                ITick[] ticks = { animator };
+
+                bodyAnimationNode[EntityState.Idle][Orientation.Down] = ticks;
+            }
+
+            SetBodyTexture(EntityState.Idle, Orientation.Down);
+        }
+
+        private void OnTriggerEnter2D(Collider2D other)
+        {
+            var entity = other.GetComponent<Character>();
+            if (entity == null) return;
+            if (entity.TryPickupItem(itemResource, 1) <= 0)
+            {
+                Kill();
+            }
+        }
+    }
+}