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/preload/index.ts

@@ -2,7 +2,7 @@ import { contextBridge, ipcRenderer } from 'electron'
 import { electronAPI } from '@electron-toolkit/preload'
 import type { MySqlConfig, SqlServerConfig } from '../main/types/ipc-api.types'
 import type { ExtractorInput } from '../main/types/extractor.types'
-import type { CleanerInput } from '../main/types/cleaner.types'
+import type { CleanerInput, ExportResultItem } from '../main/types/cleaner.types'
 import type { ResolverInput } from '../main/ipc/resolver-handler'
 import type { LoginRequest } from '../main/ipc/auth-handler'
 import type { UserInfo } from '../main/types/user.types'
@@ -27,7 +27,8 @@ const api = {
 
   // Cleaner service
   cleaner: {
-    runCleaner: (input: CleanerInput) => ipcRenderer.invoke('cleaner:run', input)
+    runCleaner: (input: CleanerInput) => ipcRenderer.invoke('cleaner:run', input),
+    exportResults: (items: ExportResultItem[]) => ipcRenderer.invoke('cleaner:exportResults', items)
   },
 
   // Order number resolver