fix(player): 补挂 CheckpointRespawnHandler——存活回检查点链路接通

PlacePlayer 脚手架新增 CheckpointRespawnHandler 并自动绑定
EVT_CheckpointRespawn/EVT_FadeOutRequest/EVT_FadeInRequest；
Player.prefab 同步补挂修正。此前 LethalTrap 存活路径 Raise 的
EVT_CheckpointRespawn 无任何监听者，玩家不会被传送回检查点。

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Assets/_Game/Prefabs/Player/Player.prefab

@@ -248,6 +248,7 @@ GameObject:
   - component: {fileID: 8116248334753210478}
   - component: {fileID: 2674139131311821727}
   - component: {fileID: 1348220184733719450}
+  - component: {fileID: 6289226623396459915}
   m_Layer: 9
   m_Name: Player
   m_TagString: Player
@@ -777,8 +778,22 @@ MonoBehaviour:
     serializedVersion: 2
     m_Bits: 16777216
   _inputReader: {fileID: 11400000, guid: 88fadef8bc554e04483edd7418d20aa2, type: 2}
-  _onShowInteractPrompt: {fileID: 11400000, guid: 18bb3dbe7d352dc4a9b62b13e068eb9d, type: 2}
-  _onHideInteractPrompt: {fileID: 11400000, guid: b8cfbee27c2493e4ea75b4158a74a7c4, type: 2}
+--- !u!114 &6289226623396459915
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 6834103521996502824}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 7ca41f67644b6b843ba7ef65e78b13e5, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
+  _onCheckpointRespawn: {fileID: 11400000, guid: eef5aef659932dd448be6d91119082e6, type: 2}
+  _onFadeOutRequest: {fileID: 11400000, guid: a17901d6793dcf2409e2672ffb383208, type: 2}
+  _onFadeInRequest: {fileID: 11400000, guid: f8d520fe699782b4184ff72ce5200c25, type: 2}
+  _fadeHalfDuration: 0.2
 --- !u!1001 &5247753868797769228
 PrefabInstance:
   m_ObjectHideFlags: 0