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

@@ -0,0 +1,37 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+"""
+实时输出流模块
+"""
+
+
+class RealtimeOutput:
+    """实时输出流，每次写入立即回调通知"""
+
+    def __init__(self, callback):
+        """
+        初始化实时输出流
+
+        Args:
+            callback: 写入时的回调函数，接收文本内容
+        """
+        self.callback = callback
+        self.buffer = []
+
+    def write(self, text):
+        """写入文本"""
+        if text:
+            # 将文本按行分割，逐行回调
+            lines = text.split("\n")
+            for line in lines:
+                if line:  # 忽略空行（由 split 产生）
+                    self.callback(line)
+        return len(text)
+
+    def flush(self):
+        """刷新（兼容性方法）"""
+        pass
+
+    def isatty(self):
+        """返回 False，表示不是终端"""
+        return False