功能：实现 Group_Horse_Racing 群赛马插件

- 新增群赛马游戏插件，支持多人参与赛马竞猜

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

danding_bot/plugins/group_horse_racing/models.py

@@ -0,0 +1,55 @@
+from dataclasses import dataclass, field
+from enum import Enum
+from datetime import datetime
+from typing import Optional
+
+
+class RoomState(str, Enum):
+    WAITING = "waiting"
+    RUNNING = "running"
+    FINISHED = "finished"
+    INTERRUPTED = "interrupted"
+
+
+class HorseState(str, Enum):
+    READY = "ready"
+    RACING = "racing"
+    FINISHED = "finished"
+
+
+@dataclass
+class Horse:
+    owner_id: str
+    name: str
+    position: float = 0.0
+    state: HorseState = HorseState.READY
+
+
+@dataclass
+class Bet:
+    user_id: str
+    horse_name: str
+    amount: int
+
+
+@dataclass
+class Room:
+    scope: str
+    state: RoomState = RoomState.WAITING
+    created_at: datetime = field(default_factory=datetime.now)
+    horses: dict[str, Horse] = field(default_factory=dict)
+    bets: list[Bet] = field(default_factory=list)
+    champion_name: Optional[str] = None
+    tick_count: int = 0
+
+
+@dataclass
+class RaceResult:
+    race_id: str
+    scope: str
+    champion_name: str
+    champion_owner: str
+    participants: list[str]
+    bet_distribution: dict[str, int]
+    duration_ticks: int
+    completed_at: datetime