feat: 抽卡签到功能 - 首次抽卡/三连自动签到获随机积分

- data_manager: 新增 daily_sign_in 表、has_signed_in_today、record_sign_in 方法
- utils: 新增 get_luck_description、format_sign_in_message 函数
- __init__: 新增 try_handle_daily_sign_in 签到入口
- handle_gacha/handle_triple_gacha 成功路径 finish()→send()+签到+return
- 签到失败不影响抽卡主流程，UNIQUE约束防并发重复

danding_bot/plugins/onmyoji_gacha/utils.py

@@ -1,5 +1,5 @@
 import os
-from typing import Union, Optional
+from typing import Optional
 from pathlib import Path
 
 def get_image_path(file_path: str) -> str:
@@ -9,4 +9,34 @@ def get_image_path(file_path: str) -> str:
 def format_user_mention(user_id: str, user_name: Optional[str] = None) -> str:
     """格式化用户@信息"""
     display_name = user_name if user_name else f"用户{user_id}"
-    return f"@{display_name}" 
+    return f"@{display_name}" 
+
+
+def get_luck_description(points: int) -> tuple[str, str]:
+    """根据积分返回运气描述与emoji"""
+    if points <= 10:
+        return "非酋", "😭"
+    if points <= 30:
+        return "一般", "😐"
+    if points <= 60:
+        return "小欧", "😊"
+    if points <= 90:
+        return "大欧", "🎉"
+    return "欧皇", "👑"
+
+
+def format_sign_in_message(
+    user_id: str,
+    user_name: str,
+    points: int,
+    balance: int,
+) -> str:
+    """格式化签到成功消息"""
+    luck_text, luck_emoji = get_luck_description(points)
+    mention = format_user_mention(user_id, user_name)
+    return (
+        f"{mention} 📅 每日签到成功！\n"
+        f"🎁 获得积分：{points}\n"
+        f"{luck_emoji} 今日运气：{luck_text}\n"
+        f"💰 当前积分：{balance}"
+    )