修复：group_horse_racing 权限检查问题1

- 添加 field_validator 来正确解析环境变量中的 ID 集合
- 支持 JSON 格式 "[1424473282]" 和逗号分隔格式 "1424473282,621016172"
- 修复 TESTERS、TEST_GROUPS、ALLOWED_GROUPS 的环境变量解析
- 移除调试日志，保持代码整洁

这解决了环境变量中的 JSON 字符串无法正确解析为集合的问题。

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

danding_bot/plugins/group_horse_racing/config.py

@@ -1,5 +1,6 @@
-from pydantic import Field
+from pydantic import Field, field_validator
 from pydantic_settings import BaseSettings, SettingsConfigDict
+from typing import Union
 
 
 class Config(BaseSettings):
@@ -35,3 +36,27 @@ class Config(BaseSettings):
     )
 
     RACE_DB_FILE: str = "data/group_horse_racing/race.db"
+
+    @field_validator("TESTERS", "TEST_GROUPS", "ALLOWED_GROUPS", mode="before")
+    @classmethod
+    def parse_id_sets(cls, v):
+        """Parse ID sets from various formats."""
+        if isinstance(v, set):
+            return v
+        if isinstance(v, str):
+            # Handle JSON string format like "[1424473282]"
+            import json
+            try:
+                parsed = json.loads(v)
+                if isinstance(parsed, list):
+                    return set(int(x) for x in parsed)
+            except (json.JSONDecodeError, ValueError, TypeError):
+                pass
+            # Handle comma-separated format
+            try:
+                return set(int(x.strip()) for x in v.split(",") if x.strip())
+            except ValueError:
+                pass
+        if isinstance(v, (list, tuple)):
+            return set(int(x) for x in v)
+        return v if isinstance(v, set) else set()