fix: resolve RealtimeOutput import error by moving to utils package

Python prefers packages over modules, causing imports to resolve to
gui/utils/__init__.py instead of gui/utils.py. Moved RealtimeOutput
class into the utils package to fix the ImportError.

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

gui/utils/__init__.py

@@ -7,6 +7,7 @@ GUI Utilities - GUI 工具模块
 """
 from gui.utils.decorators import require_admin, require_permission
 from gui.utils.error_handler import ErrorHandler
+from gui.utils.realtime_output import RealtimeOutput
 from gui.utils.state_manager import StateManager
 from gui.utils.validators import Validator, ValidationResult, ValidatedWidget
 
@@ -14,6 +15,7 @@ __all__ = [
     'require_admin',
     'require_permission',
     'ErrorHandler',
+    'RealtimeOutput',
     'StateManager',
     'Validator',
     'ValidationResult',

gui/utils/realtime_output.py

@@ -1,9 +1,7 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 """
-GUI 工具模块
-
-提供 GUI 相关的工具类和函数。
+实时输出流模块
 """
 
 
@@ -36,4 +34,4 @@ class RealtimeOutput:
 
     def isatty(self):
         """返回 False，表示不是终端"""
-        return False
+        return False