Checkpoint 5 & Checkpoint 6：

- SimulationWorld 只做逻辑计算与数据输出，不再直接写 Transform
- 在 ShowEntitySuccess 中接入 Pickup/Projectile 占位注册：
	- Drop 走 UpsertPickup(...)
	- Bullet/Projectile 走 UpsertProjectile(...)
- 在 HideEntityComplete 中接入对应回收：
	- Drop 走 RemovePickupByEntityId(...)
	- Bullet/Projectile 走 RemoveProjectileByEntityId(...)
- 新增占位数据构造：
	- CreatePickupSimData(...)
	- CreateProjectileSimData(...)
- 调整 EnemyManagerComponent 职责，现在只管“敌人相关”：
	- 敌人刷怪节奏
	- 敌人列表缓存与计数
	- 玩家引用与 enemy.SetTarget(...)
- 新增嵌套类 SimulationWorld.Presentation，专门消费 EnemySimData 并回写 position/rotation
- 新增嵌套类 SimulationWorld.EntitySync 负责“Simulation 同步”：
	- 监听 ShowEntitySuccess/HideEntityComplete
	- 同步 Enemy/Drop/Projectile 到 SimulationWorld
	- 敌人 SimData 构建、Pickup/Projectile 占位数据构建

Assets/GameMain/Scripts/Simulation/SimData/EnemySimData.cs

@@ -0,0 +1,19 @@
+using UnityEngine;
+
+namespace Simulation
+{
+    public struct EnemySimData
+    {
+        public int EntityId;
+        public Vector3 Position;
+        public Vector3 Forward;
+        public Quaternion Rotation;
+        public float Speed;
+        public float AttackRange;
+        public bool AvoidEnemyOverlap;
+        public float EnemyBodyRadius;
+        public int SeparationIterations;
+        public int TargetType;
+        public int State;
+    }
+}

Assets/GameMain/Scripts/Simulation/SimData/EnemySimData.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: ef2eea85685544189eef2d9f2cece080
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/GameMain/Scripts/Simulation/SimData/PickupSimData.cs

@@ -0,0 +1,12 @@
+using UnityEngine;
+
+namespace Simulation
+{
+    public struct PickupSimData
+    {
+        public int EntityId;
+        public Vector3 Position;
+        public float PickupRadius;
+        public int State;
+    }
+}

Assets/GameMain/Scripts/Simulation/SimData/PickupSimData.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: ff6e8b75e4af4c3ca9e3b732b1383f95
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/GameMain/Scripts/Simulation/SimData/ProjectileSimData.cs

@@ -0,0 +1,15 @@
+using UnityEngine;
+
+namespace Simulation
+{
+    public struct ProjectileSimData
+    {
+        public int EntityId;
+        public int OwnerEntityId;
+        public Vector3 Position;
+        public Vector3 Forward;
+        public float Speed;
+        public float RemainingLifetime;
+        public int State;
+    }
+}

Assets/GameMain/Scripts/Simulation/SimData/ProjectileSimData.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 2eec1f4389004d69bdce8c4dd95d255e
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: