fix(test): 移除测试赛马模拟中的锁机制以避免死锁

重构测试模拟赛马流程，移除房间锁获取逻辑，改为直接清理现有房间状态。
引入沙盒环境构建提示信息，提升测试过程的可观测性。

danding_bot/plugins/group_horse_racing/test_commands.py

@@ -205,24 +205,17 @@ async def handle_test_simulate_race(bot: Bot, event: Event):
     await test_simulate_race_cmd.send("收到：测试模拟赛马，开始执行完全模拟（无真实积分/数据库副作用）")
 
     scope = get_scope(event)
-    lock = room_store.get_lock(scope)
-    try:
-        await asyncio.wait_for(lock.acquire(), timeout=3)
-    except TimeoutError:
-        await test_simulate_race_cmd.finish("完全模拟失败：房间锁被占用（可能有卡住的赛马/测试任务），请稍后重试或先重启 Bot")
-        return
-
     try:
         race_engine.stop_race(scope)
         room_store.delete_room(scope)
-    finally:
-        lock.release()
-
+    except Exception:
+        pass
     original_room_store = commands_mod.room_store
     original_points_service = commands_mod.points_service
     original_message_service = commands_mod.message_service
     original_tick_interval = commands_mod.config.RACE_TICK_INTERVAL
 
+
     fake_room_store = _InMemoryRoomStore()
     fake_points_service = _InMemoryPointsService()
     fake_message_service = _NoopMessageService()
@@ -232,6 +225,7 @@ async def handle_test_simulate_race(bot: Bot, event: Event):
     room = None
 
     try:
+        await test_simulate_race_cmd.send("阶段：构建沙盒环境与参赛数据")
         commands_mod.room_store = fake_room_store
         commands_mod.points_service = fake_points_service
         commands_mod.message_service = fake_message_service
@@ -252,6 +246,7 @@ async def handle_test_simulate_race(bot: Bot, event: Event):
         for horse in room.horses.values():
             horse.state = HorseState.RACING
 
+        await test_simulate_race_cmd.send("阶段：执行赛程（后台任务）")
         start_task = asyncio.create_task(commands_mod.run_race_with_settlement(fake_bot, room, scope))
         commands_mod.race_engine.register_task(scope, start_task)
         await asyncio.wait_for(start_task, timeout=15)