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>

config/schema.py

@@ -297,6 +297,26 @@ class UIConfig:
         return errors
 
 
+@dataclass
+class ExecutionConfig:
+    """执行配置（用于删除操作等）"""
+
+    dryrun: bool = False  # 预览模式，不保存更改
+
+    @classmethod
+    def from_env(cls) -> "ExecutionConfig":
+        """从环境变量创建配置"""
+        from config.env_loader import get_env_bool
+
+        return cls(
+            dryrun=get_env_bool("EXECUTION_DRYRUN", False),
+        )
+
+    def validate(self) -> list[str]:
+        """验证配置，返回错误列表"""
+        return []  # dryrun 是布尔值，无需验证
+
+
 @dataclass
 class AppConfig:
     """应用总配置"""
@@ -307,6 +327,7 @@ class AppConfig:
     extraction: ExtractionConfig
     validation: ValidationConfig
     ui: UIConfig
+    execution: ExecutionConfig
 
     @classmethod
     def from_env(cls) -> "AppConfig":
@@ -318,6 +339,7 @@ class AppConfig:
             extraction=ExtractionConfig.from_env(),
             validation=ValidationConfig.from_env(),
             ui=UIConfig.from_env(),
+            execution=ExecutionConfig.from_env(),
         )
 
     def validate(self) -> list[str]:
@@ -329,6 +351,7 @@ class AppConfig:
         errors.extend(self.extraction.validate())
         errors.extend(self.validation.validate())
         errors.extend(self.ui.validate())
+        errors.extend(self.execution.validate())
         return errors
 
     def to_dict(self) -> dict:
@@ -384,4 +407,7 @@ class AppConfig:
                 "font_size": self.ui.font_size,
                 "production_id_input_width": self.ui.production_id_input_width,
             },
+            "execution": {
+                "dryrun": self.execution.dryrun,
+            },
         }