style: format all Python files with Black

Apply Black formatter to the entire codebase for consistent code style.

Co-Authored-By: Claude (glm-5) <noreply@anthropic.com>

gui/config_manager.py

@@ -6,6 +6,7 @@
 负责加载、保存和管理用户配置。
 支持从环境变量和 .env 文件加载配置。
 """
+
 import os
 from typing import TYPE_CHECKING
 from config.loader import ConfigLoader
@@ -20,7 +21,9 @@ if TYPE_CHECKING:
 class ConfigManager:
     """配置管理器"""
 
-    def __init__(self, config_file: str = "config/user_settings.json", use_env: bool = True):
+    def __init__(
+        self, config_file: str = "config/user_settings.json", use_env: bool = True
+    ):
         """
         初始化配置管理器
 
@@ -99,7 +102,9 @@ class ConfigManager:
         field_type = type(getattr(obj, target_field))
 
         # 如果是字符串且目标字段是枚举类型，进行转换
-        if isinstance(value, str) and hasattr(field_type, "__members__"):  # 它是一个 Enum
+        if isinstance(value, str) and hasattr(
+            field_type, "__members__"
+        ):  # 它是一个 Enum
             try:
                 value = field_type(value)
             except ValueError: