Refactor and enhance document and recipe import functionality

- Removed the QuickImport module and service to streamline the codebase.
- Introduced DocumentImport module, service, and controller for handling PDF uploads and conversions to Markdown.
- Added PdfParser for parsing PDF files and extracting text.
- Implemented DocumentParser as an abstract class for future document parsers.
- Created a new GenericRecipeParser and IcaRecipeParser for handling recipe data from various sources.
- Developed QuickImportService to manage recipe scraping from URLs.
- Enhanced error handling and validation for file uploads and input processing.
- Updated project documentation with a structured plan for future development and improvements.

backend/src/document-service/services/document-service.module.ts

@@ -0,0 +1,9 @@
+import { Module } from '@nestjs/common';
+import { DocumentImportController } from './controllers/document-import.controller';
+import { DocumentImportService } from './services/document-import.service';
+
+@Module({
+  controllers: [DocumentImportController],
+  providers: [DocumentImportService],
+})
+export class DocumentServiceModule {}