feat: add database-driven material validation with multi-mode support

This commit enhances the material validation functionality to support
database-driven workflows alongside the existing Excel-based approach.

## New Features

### DAO Layer
- Add ProductionContractDataDAO for querying production contract data
- Add MaterialsToBeDeletedDAO with full CRUD operations
- Enhance DiscreteMaterialPlanDAO with query_all(), query_by_source_numbers(),
  and get_unique_material_names() methods

### Validation Modes
Support for 4 validation modes in MaterialValidationTab:
1. Database Full - Query all materials from DiscreteMaterialPlanData
2. Database Filtered - Query by ProductionID.txt file
3. Excel Existing - Validate from existing Excel file
4. Excel Full - Complete workflow with ERP extraction

### Configuration
- Add ValidationConfig dataclass with data_source, batch_size, match_mode,
  enable_crud_operations, and default_manager fields
- Update ConfigLoader to support validation configuration
- Add validation settings section in SettingsTab GUI

### Query Chain
Implementation of full query chain:
ProductionID.txt (总排号) → productionContractData (生产订单号) →
DiscreteMaterialPlanData (SourceNumber) → MaterialName →
MaterialsToBeDeleted comparison

## Backward Compatibility
All existing Excel-based validation methods remain unchanged, ensuring
no breaking changes for existing workflows.

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

config/loader.py

@@ -107,6 +107,7 @@ class ConfigLoader:
         database_dict = settings.get("database", {})
         paths_dict = settings.get("paths", {})
         extraction_dict = settings.get("extraction", {})
+        validation_dict = settings.get("validation", {})
 
         return AppConfig(
             erp=ERPConfig(
@@ -142,9 +143,18 @@ class ConfigLoader:
                 verbose=extraction_dict.get("verbose", True),
                 auto_convert=extraction_dict.get("auto_convert", True),
                 merge_batches=extraction_dict.get("merge_batches", True),
+                enable_db_persistence=extraction_dict.get("enable_db_persistence", False),
+            ),
+            validation=ValidationConfig(
+                data_source=validation_dict.get("data_source", "database_full"),
+                use_database=validation_dict.get("use_database", True),
+                batch_size=validation_dict.get("batch_size", 2000),
+                enable_crud_operations=validation_dict.get("enable_crud_operations", False),
+                default_manager=validation_dict.get("default_manager", ""),
+                match_mode=validation_dict.get("match_mode", "substring"),
             ),
         )
 
 
 # 为了兼容旧代码，导入必要的类型
-from config.schema import ERPConfig, DatabaseConfig, PathConfig, ExtractionConfig
+from config.schema import ERPConfig, DatabaseConfig, PathConfig, ExtractionConfig, ValidationConfig