```

feat(gameplay): 调整单位属性和纹理设置并优化主角移动系统

- 修改多个纹理资源的最大尺寸从2048降至512，并添加PlayableAds平台设置
- 调整第一、二章多个单位的移动速度、攻击力和攻击持续时间参数
- 重命名精锐士兵预制体名称，移除"新"字后缀
- 降低精锐士兵的攻击力和攻击持续时间

- 为主角战斗组件添加detectRange字段，实现寻敌和攻击范围分离
- 重构主角移动系统，从点击移动改为自动巡逻模式，增加栓绳机制防止远离基地
- 实现巡逻和追击状态切换，在发现敌人时停止巡逻进行攻击
-

Assets/Script/MainCharacterCombat.cs

@@ -7,6 +7,9 @@ public class MainCharacterCombat : MonoBehaviour
     [Min(0f)]
     public float attackRange = 8f;
 
+    [Min(0f)]
+    public float detectRange = 10f;
+
     [Min(0f)]
     public float attackPower = 50f;
 
@@ -86,13 +89,39 @@ public class MainCharacterCombat : MonoBehaviour
             return;
         }
 
-        if (movement == null || movement.IsMoving || animator == null)
+        if (animator == null)
         {
             return;
         }
 
+        // 巡逻中也能发现敌人；发现后停止巡逻，没有敌人则恢复巡逻
         target = FindNearestEnemy();
-        if (target == null || attackCooldown > 0f)
+        if (target == null)
+        {
+            if (movement != null)
+            {
+                movement.ClearChaseTarget();
+                movement.SetPatrolEnabled(true);
+            }
+            return;
+        }
+
+        if (movement != null)
+        {
+            movement.SetPatrolEnabled(false);
+
+            // 寻敌范围内但超出攻击范围：主动走近敌人再攻击（受基地栓绳限制）
+            float targetDistance = GetHorizontalDistance(target.transform.position);
+            if (targetDistance > attackRange)
+            {
+                movement.SetChaseTarget(target.transform.position);
+                return;
+            }
+
+            movement.ClearChaseTarget();
+        }
+
+        if (attackCooldown > 0f)
         {
             return;
         }
@@ -165,7 +194,7 @@ public class MainCharacterCombat : MonoBehaviour
 
         if (movement != null)
         {
-            movement.StopMovement();
+            movement.SetPatrolEnabled(false);
         }
 
         if (attacking)
@@ -334,8 +363,7 @@ public class MainCharacterCombat : MonoBehaviour
 
     private bool IsInsideMovementBounds(Vector3 position)
     {
-        return movement == null || (position.x >= movement.xLimits.x && position.x <= movement.xLimits.y
-            && position.z >= movement.zLimits.x && position.z <= movement.zLimits.y);
+        return movement == null || movement.IsWithinLeash(position);
     }
 
     private void CheckSummonFinished()
@@ -466,10 +494,18 @@ public class MainCharacterCombat : MonoBehaviour
         animator.SetInteger("speed", 0);
     }
 
+    private float GetHorizontalDistance(Vector3 position)
+    {
+        Vector3 offset = position - transform.position;
+        offset.y = 0f;
+        return offset.magnitude;
+    }
+
     private GameObject FindNearestEnemy()
     {
+        // 索敌范围使用较小的 detectRange，主角不主动远离基地寻找敌人
         GameObject nearest = null;
-        float nearestDistance = attackRange * attackRange;
+        float nearestDistance = detectRange * detectRange;
 
         foreach (GameObject enemy in GameObject.FindGameObjectsWithTag("Enemy"))
         {