feat: add export validation results to Excel feature

Add export functionality to CleanerPage that allows users to export
the currently displayed validation results to an Excel file.

- Add ExportResultItem and ExportResultResponse types
- Create ResultExporter service using ExcelJS
- Register cleaner:exportResults IPC handler
- Add exportResults method to preload API
- Connect export button in CleanerPage to export handler

Export features:
- Exports filtered results (respecting manager/visibility filters)
- Includes selection status column
- Saves to app data directory/exports/校验结果.xlsx

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

src/main/types/cleaner.types.ts

@@ -19,3 +19,32 @@ export interface OrderCleanDetail {
   materialsSkipped: number
   errors: string[]
 }
+
+/**
+ * Single validation result item for export
+ */
+export interface ExportResultItem {
+  materialName: string
+  materialCode: string
+  specification: string
+  model: string
+  managerName: string
+  isMarkedForDeletion: boolean
+  isSelected: boolean
+}
+
+/**
+ * Request payload for exporting validation results
+ */
+export interface ExportResultRequest {
+  items: ExportResultItem[]
+}
+
+/**
+ * Response for export operation
+ */
+export interface ExportResultResponse {
+  success: boolean
+  filePath?: string
+  error?: string
+}

src/main/types/ipc-api.types.ts

@@ -4,7 +4,12 @@
  */
 
 import type { ExtractorInput, ExtractorResult } from './extractor.types'
-import type { CleanerInput, CleanerResult } from './cleaner.types'
+import type {
+  CleanerInput,
+  CleanerResult,
+  ExportResultItem,
+  ExportResultResponse
+} from './cleaner.types'
 
 /**
  * MySQL connection configuration
@@ -104,6 +109,12 @@ export interface CleanerAPI {
   runCleaner: (
     input: CleanerInput
   ) => Promise<{ success: boolean; data?: CleanerResult; error?: string }>
+
+  /**
+   * Export validation results to Excel
+   * @param items - Validation result items to export
+   */
+  exportResults: (items: ExportResultItem[]) => Promise<ExportResultResponse>
 }
 
 /**