fix: Export QuickImportResult interface for proper type usage in QuickImportController

backend/src/quick-import/quick-import.controller.ts

@@ -1,5 +1,5 @@
 import { Controller, Post, Body } from '@nestjs/common';
-import { QuickImportService } from './quick-import.service';
+import { QuickImportService, QuickImportResult } from './quick-import.service';
 
 @Controller('quick-import')
 export class QuickImportController {
@@ -8,7 +8,7 @@ export class QuickImportController {
   @Post()
   async importFromInput(
     @Body() body: { input: string }
-  ) {
+  ): Promise<QuickImportResult> {
     return this.quickImportService.importFromInput(body.input);
   }
 }

backend/src/quick-import/quick-import.service.ts

@@ -1,6 +1,6 @@
 import { Injectable, BadRequestException } from '@nestjs/common';
 
-interface QuickImportResult {
+export interface QuickImportResult {
   markdown: string;
   source: 'ica' | 'pdf' | 'other';
 }