fix: 修复捉虫计划鸣谢名单表 user_slug 字段的错误类型

backend/models/debug_project_record.py

@@ -29,7 +29,7 @@ async def _create_table(cls) -> None:
                 module TEXT NOT NULL,
                 description TEXT NOT NULL,
                 user_name TEXT NOT NULL,
-                user_slug CHAR(12) NOT NULL,
+                user_slug VARCHAR(12) NOT NULL,
                 reward SMALLINT NOT NULL
             );
             """