fix: settle_race返回tuple消除odds重复计算

- settle_race() 返回 tuple[RaceResult, odds] | None
- run_race_with_settlement 解包使用，移除多余 calculate_odds 调用
- _test_send_to_scope 签名已兼容(含*args/**kwargs)

danding_bot/plugins/group_horse_racing/commands.py

@@ -226,8 +226,8 @@ def calculate_odds(room: Room) -> dict[str, float]:
     return odds
 
 
-async def settle_race(room: Room) -> RaceResult | None:
-    """Settle bets and rewards after race finishes."""
+async def settle_race(room: Room) -> tuple[RaceResult, dict[str, float]] | None:
+    """Settle bets and rewards after race finishes. Returns (result, odds) or None."""
     champion = room.horses.get(room.champion_name)
     if not champion:
         return None
@@ -261,7 +261,7 @@ async def settle_race(room: Room) -> RaceResult | None:
         odds_snapshot=odds,
     )
     await room_store.save_race_result(result)
-    return result
+    return result, odds
 
 
 async def _send_to_scope(bot: Bot, scope: str, message: str, message_type: str = "race_update"):
@@ -303,14 +303,15 @@ async def run_race_with_settlement(bot: Bot, room: Room, scope: str):
             await points_service.refund_bet_points(bet.user_id, bet.amount, "比赛中断退还")
         return
 
-    # Settle
-    result = await settle_race(room)
+    # Settle (returns (result, odds) or None)
+    settlement = await settle_race(room)
+    result = settlement[0] if settlement else None
+    odds = settlement[1] if settlement else {}
 
     # Build user_id -> display name mapping
     all_user_ids = [h.owner_id for h in room.horses.values()] + [b.user_id for b in room.bets]
     name_map = await _build_name_map(bot, scope, all_user_ids)
 
-    odds = calculate_odds(room)
     champion = room.horses.get(room.champion_name)
     champion_name_display = name_map.get(champion.owner_id, champion.owner_id) if champion else '?'
     result_lines = [