feat(赛马插件): 调整参与奖励并优化赛马显示对齐

- 将参与奖励从50点降低到20点以平衡经济系统
- 为所有马主添加参与奖励计算和发放逻辑
- 优化赛况显示中的马名对齐，支持中文字符宽度计算

danding_bot/plugins/group_horse_racing/race_engine.py

@@ -58,10 +58,21 @@ class RaceEngine:
         lines = [f"【第{room.tick_count}回合】"]
 
         sorted_horses = sorted(room.horses.values(), key=lambda h: h.index)
+        # Calculate max display width for name alignment
+        # Each CJK/fullwidth char counts as 2, others as 1
+        def _display_width(s: str) -> int:
+            w = 0
+            for ch in s:
+                w += 2 if '\u4e00' <= ch <= '\u9fff' or '\u3000' <= ch <= '\u303f' or '\uff00' <= ch <= '\uffef' else 1
+            return w
+
+        max_name_width = max(_display_width(h.name) for h in sorted_horses)
+
         for horse in sorted_horses:
             progress = min(horse.position / distance, 1.0)
             filled = int(progress * bar_width)
             bar = "█" * filled + "░" * (bar_width - filled)
-            lines.append(f"  {horse.index:02d}号 {horse.name} |{bar}| {horse.position:.1f}m")
+            pad = " " * (max_name_width - _display_width(horse.name))
+            lines.append(f"  {horse.index:02d}号 {horse.name}{pad} |{bar}| {horse.position:.1f}m")
 
         return "\n".join(lines)