fix: 플레이어 스폰 위치 중복 문제 해결 — Round-Robin 순차 할당 도입

- PlayerSpawnPoint.GetRandomSpawnPoint()을 랜덤에서 Round-Robin 순차 할당으로 변경
- 접속 순서대로 스폰 포인트를 순환하며 중복 스폰 방지
- BalanceDummy 씬에 두 번째 스폰 포인트 추가 (x=-5, y=3, z=0)

Assets/Scenes/BalanceDummy.unity

@@ -4324,6 +4324,51 @@ PrefabInstance:
     m_AddedGameObjects: []
     m_AddedComponents: []
   m_SourcePrefab: {fileID: 100100000, guid: bf62c127a7934334d9b955503391f574, type: 3}
+--- !u!1 &808329368
+GameObject:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  serializedVersion: 6
+  m_Component:
+  - component: {fileID: 808329370}
+  - component: {fileID: 808329369}
+  m_Layer: 0
+  m_Name: SpawnPoint (2)
+  m_TagString: Untagged
+  m_Icon: {fileID: 0}
+  m_NavMeshLayer: 0
+  m_StaticEditorFlags: 0
+  m_IsActive: 1
+--- !u!114 &808329369
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 808329368}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: aba9a2eb2571da14d901ed51c8866f47, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: Colosseum.Game::Colosseum.Network.PlayerSpawnPoint
+  useRotation: 1
+--- !u!4 &808329370
+Transform:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 808329368}
+  serializedVersion: 2
+  m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
+  m_LocalPosition: {x: -5, y: 3, z: 0}
+  m_LocalScale: {x: 1, y: 1, z: 1}
+  m_ConstrainProportionsScale: 0
+  m_Children: []
+  m_Father: {fileID: 0}
+  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
 --- !u!4 &817798737 stripped
 Transform:
   m_CorrespondingSourceObject: {fileID: 1824081129582740912, guid: bf62c127a7934334d9b955503391f574, type: 3}
@@ -13610,3 +13655,4 @@ SceneRoots:
   - {fileID: 1108135668}
   - {fileID: 6925510005455365094}
   - {fileID: 1793508636}
+  - {fileID: 808329370}

Assets/_Game/Scripts/Network/PlayerSpawnPoint.cs

@@ -5,13 +5,15 @@ namespace Colosseum.Network
     /// <summary>
     /// 플레이어 스폰 위치 마커
     /// 씬에 배치하여 플레이어가 스폰될 위치를 지정
+    /// Round-Robin 순차 할당으로 중복 스폰 방지
     /// </summary>
     public class PlayerSpawnPoint : MonoBehaviour
     {
         [Header("Spawn Settings")]
         [SerializeField] private bool useRotation = true;
 
-        private static System.Collections.Generic.List<PlayerSpawnPoint> spawnPoints = new System.Collections.Generic.List<PlayerSpawnPoint>();
+        private static readonly System.Collections.Generic.List<PlayerSpawnPoint> spawnPoints = new System.Collections.Generic.List<PlayerSpawnPoint>();
+        private static int nextSpawnIndex;
 
         private void Awake()
         {
@@ -24,17 +26,23 @@ namespace Colosseum.Network
         }
 
         /// <summary>
-        /// 사용 가능한 스폰 포인트 중 하나를 반환
+        /// Round-Robin 순차 할당 — 접속 순서대로 순환하며 중복 없이 반환
         /// </summary>
-        public static Transform GetRandomSpawnPoint()
+        public static Transform GetNextSpawnPoint()
         {
             if (spawnPoints.Count == 0)
                 return null;
 
-            int index = Random.Range(0, spawnPoints.Count);
+            int index = nextSpawnIndex % spawnPoints.Count;
+            nextSpawnIndex++;
             return spawnPoints[index].transform;
         }
 
+        /// <summary>
+        /// 사용 가능한 스폰 포인트 중 하나를 반환 (기존 호환용, 내부적으로 Round-Robin 사용)
+        /// </summary>
+        public static Transform GetRandomSpawnPoint() => GetNextSpawnPoint();
+
         /// <summary>
         /// 스폰 포인트 개수 반환
         /// </summary>