feat(group_horse_racing): 增加赛马消息图片渲染功能

- 在配置中新增图片渲染相关参数：RACE_RENDER_AS_IMAGE、RACE_IMAGE_WIDTH 等
- 复用 danding_qqpush 的 ImageRenderer，使其支持自定义标题
- 在比赛开始、结束和进度播报时，将文本消息转换为带标题的图片发送
- 修复测试用例中的消息发送函数调用

danding_bot/plugins/group_horse_racing/commands.py

@@ -3,8 +3,10 @@ import uuid
 from datetime import datetime
 
 from nonebot import on_command
-from nonebot.adapters.onebot.v11 import Bot, Event, GroupMessageEvent, PrivateMessageEvent
+from nonebot.adapters.onebot.v11 import Bot, Event, GroupMessageEvent, Message, MessageSegment, PrivateMessageEvent
 
+from danding_bot.plugins.danding_qqpush.config import Config as QqPushConfig
+from danding_bot.plugins.danding_qqpush.image_render import ImageRenderer
 from .room_store import RoomStore
 from .points_service import PointsService
 from .race_engine import RaceEngine
@@ -18,6 +20,39 @@ room_store = RoomStore(config)
 points_service = PointsService(config)
 race_engine = RaceEngine(config)
 message_service = MessageService(config)
+_race_image_renderer: ImageRenderer | None = None
+
+
+def _get_race_image_renderer() -> ImageRenderer:
+    global _race_image_renderer
+    if _race_image_renderer is None:
+        qqpush_config = QqPushConfig()
+        _race_image_renderer = ImageRenderer(
+            width=config.RACE_IMAGE_WIDTH,
+            font_size=config.RACE_IMAGE_FONT_SIZE,
+            padding=config.RACE_IMAGE_PADDING,
+            line_spacing=config.RACE_IMAGE_LINE_SPACING,
+            font_paths=qqpush_config.FontPaths,
+        )
+    return _race_image_renderer
+
+
+def _build_race_image_message(message: str) -> Message:
+    if message.startswith("比赛开始！"):
+        title = "🏇 赛马开赛"
+        body = message.replace("比赛开始！", "发令枪响，比赛正式开始！", 1)
+    elif message.startswith("比赛结束！"):
+        title = "🏆 赛马结果"
+        body = message
+    else:
+        title = "📣 赛马进度"
+        body = f"🏁 实时播报\n{message}"
+
+    renderer = _get_race_image_renderer()
+    image_base64 = renderer.render_to_base64(body, title=title)
+    message_obj = Message()
+    message_obj.append(MessageSegment.image(image_base64))
+    return message_obj
 
 
 def get_scope(event: Event) -> str:
@@ -100,11 +135,14 @@ async def settle_race(room: Room):
 async def _send_to_scope(bot: Bot, scope: str, message: str):
     """Send message to group or private chat based on scope."""
     try:
+        outbound_message: str | Message = message
+        if config.RACE_RENDER_AS_IMAGE:
+            outbound_message = _build_race_image_message(message)
         await bot.send_msg(
             message_type="group" if scope.startswith("group_") else "private",
             group_id=int(scope.split("_", 1)[1]) if scope.startswith("group_") else None,
             user_id=int(scope.split("_", 1)[1]) if scope.startswith("test_") else None,
-            message=message,
+            message=outbound_message,
         )
     except Exception:
         pass