test: 完善模拟赛马测试中的消息服务模拟

为 _NoopMessageService 添加基本消息记录和撤回功能，以支持 race_update 消息的防刷屏机制。这使得测试环境能更真实地模拟生产代码的行为，确保在模拟密集更新时不会因消息过多而影响测试观察。

danding_bot/plugins/group_horse_racing/test_commands.py

@@ -196,14 +196,42 @@ class _InMemoryPointsService:
 
 
 class _NoopMessageService:
+    def __init__(self):
+        self.last_messages: dict[str, dict[str, str]] = {}
+
     def clear_pending_recalls(self, scope: str):
-        return
+        if scope in self.last_messages:
+            del self.last_messages[scope]
 
     async def send_with_recall(self, bot, scope, message_type, message):
+        # Support basic recall for race_update to avoid flooding during simulation
+        if message_type == "race_update":
+            await self.recall_previous_of_type(bot, scope, "race_update")
+
+        is_group = scope.startswith("group_")
+        result = await bot.send_msg(
+            message_type="group" if is_group else "private",
+            group_id=int(scope.split("_", 1)[1]) if is_group else None,
+            user_id=int(scope.split("_", 1)[1]) if not is_group else None,
+            message=message,
+        )
+
+        if scope not in self.last_messages:
+            self.last_messages[scope] = {}
+        
+        if isinstance(result, dict) and "message_id" in result:
+            self.last_messages[scope][message_type] = result["message_id"]
+
         return "fake_msg_id"
 
     async def recall_previous_of_type(self, bot, scope, message_type):
-        return
+        if scope in self.last_messages and message_type in self.last_messages[scope]:
+            msg_id = self.last_messages[scope][message_type]
+            try:
+                await bot.delete_msg(message_id=msg_id)
+            except Exception:
+                pass
+            del self.last_messages[scope][message_type]
 
 
 @test_simulate_race_cmd.handle()