feat: add delete execution feature with progress tracking and dryrun mode

- Add ExecutionConfig for dryrun settings in config schema
- Create DeleteProgressWindow widget for real-time progress display
- Integrate delete execution flow in MaterialValidationTab with threading
- Add dryrun checkbox for admin users in settings
- Add progress callback support to DiscreteMaterialPlanCleaner
- Add markdown report generation with statistics
- Include tkinterweb and markdown2 dependencies for report rendering

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

gui/config_manager.py

@@ -134,6 +134,11 @@ class ConfigManager:
         """获取提取配置"""
         return self.config.extraction
 
+    @property
+    def execution(self):
+        """获取执行配置"""
+        return self.config.execution
+
 
 # 为了向后兼容，保留旧版本的导入
 DEFAULT_SETTINGS = DEFAULT_SETTINGS_DICT