修复：group_horse_racing 配置键大小写匹配问题

NoneBot 将 .env 键名转为小写，前缀匹配需使用小写 group_horse_racing_

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

danding_bot/plugins/group_horse_racing/__init__.py

@@ -19,19 +19,10 @@ __plugin_meta__ = PluginMetadata(
 # 从 NoneBot driver config 中提取本插件配置（去掉 GROUP_HORSE_RACING_ 前缀）
 _nb_config = get_driver().config
 _raw = _nb_config.model_dump() if hasattr(_nb_config, "model_dump") else _nb_config.dict()
-_prefix = "GROUP_HORSE_RACING_"
-
-print("[group_horse_racing] Raw NoneBot config keys (all):")
-for k, v in _raw.items():
-    print(f"  {k} = {v!r}")
-
-print("[group_horse_racing] Filtered plugin config:")
-for k, v in _raw.items():
-    if k.startswith(_prefix):
-        print(f"  {k} = {v!r}")
+_prefix = "group_horse_racing_"
 
 plugin_config = Config(**{
-    k[len(_prefix):]: v
+    k[len(_prefix):].upper(): v
     for k, v in _raw.items()
     if k.startswith(_prefix)
 })