refactor: restructure main_clean.py with dependency injection and interfaces

Refactor discrete material cleaner to improve maintainability and testability:

- Introduce dependency injection pattern for service components
- Add interfaces (IPageNavigator, IMaterialExtractor, IDeletionChecker)
- Extract PageNavigator service for page navigation logic
- Extract MaterialExtractor service for data extraction
- Extract DatabaseDeletionChecker service for deletion logic
- Add MaterialInfo data model for structured data
- Centralize configuration (CleanerConfig, UIConstants)
- Implement separation of concerns across services layer

Also includes comprehensive execution mechanism documentation.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

interfaces/i_page_navigator.py

@@ -0,0 +1,75 @@
+"""
+页面导航接口
+定义页面导航和 iframe 操作的抽象接口
+"""
+
+from abc import ABC, abstractmethod
+from playwright.sync_api import Page, Frame
+from typing import Tuple, Optional
+
+
+class IPageNavigator(ABC):
+    """页面导航接口 - 处理 iframe 导航、页面切换"""
+
+    @abstractmethod
+    def navigate_to_main_page(self, page: Page) -> Frame:
+        """
+        导航到主页面 iframe
+
+        Args:
+            page: 浏览器页面对象
+
+        Returns:
+            主页面 iframe 的 Frame 对象
+        """
+        pass
+
+    @abstractmethod
+    def navigate_to_order_page(self, main_frame: Frame, page: Page) -> Tuple[Page, Frame]:
+        """
+        导航到订单页面
+
+        Args:
+            main_frame: 主 iframe
+            page: 当前页面对象
+
+        Returns:
+            (新页面, 内部 iframe)
+        """
+        pass
+
+    @abstractmethod
+    def navigate_to_material_plan_page(self, page: Page) -> Tuple[Page, Frame]:
+        """
+        导航到备料计划页面
+
+        Args:
+            page: 订单页面对象
+
+        Returns:
+            (新页面, 内部 iframe)
+        """
+        pass
+
+    @abstractmethod
+    def setup_query_interface(self, frame: Frame) -> None:
+        """
+        设置查询界面
+
+        Args:
+            frame: 目标 iframe
+        """
+        pass
+
+    @abstractmethod
+    def wait_for_page_loaded(self, frame: Frame) -> bool:
+        """
+        等待页面加载完成
+
+        Args:
+            frame: 目标 iframe
+
+        Returns:
+            是否加载成功
+        """
+        pass