Rebrand project: DocumentOperator to DocumentService

This commit implements a complete rebranding of the project:
- Updated all namespaces from `DocumentOperator` to `DocumentService`.
- Renamed file paths, embedded resources, and test data references.
- Updated configuration keys, logging paths, and Redis instance names.
- Revised documentation to reflect the new project name.
- Modified project and solution files to align with the new structure.
- Updated class names, DTOs, commands, queries, and handlers.
- Adjusted middleware, controllers, and API endpoints.
- Updated Swagger metadata and API titles to `DocumentService API`.
- Refactored test namespaces, resource paths, and embedded resources.
- Updated build and deployment configurations for the new name.
- Replaced all references to `DocumentOperator` in comments and literals.

These changes ensure consistency across the codebase and documentation.

DocumentOperator.Infrastructure/Services/PdfProcessing/DevExpressPdfProcessor.cs

@@ -1,11 +1,11 @@
 using DevExpress.Pdf;
 using DevExpress.Drawing;
 using System.Drawing;
-using DocumentOperator.Application.Common.DTOs;
-using DocumentOperator.Application.Common.Interfaces;
-using DocumentOperator.Domain.Common.Exceptions;
+using DocumentService.Application.Common.DTOs;
+using DocumentService.Application.Common.Interfaces;
+using DocumentService.Domain.Common.Exceptions;
 
-namespace DocumentOperator.Infrastructure.Services.PdfProcessing;
+namespace DocumentService.Infrastructure.Services.PdfProcessing;
 
 /// <summary>
 /// PDF processor implementation using DevExpress.Pdf library.

DocumentOperator.Infrastructure/Services/QrCodeProcessing/DevExpressSwissQrCodeProcessor.cs

@@ -1,13 +1,13 @@
 using Codecrete.SwissQRBill.Generator;
 using DevExpress.Drawing;
 using DevExpress.Pdf;
-using DocumentOperator.Application.Common.Interfaces;
-using DocumentOperator.Domain.Common.Exceptions;
+using DocumentService.Application.Common.Interfaces;
+using DocumentService.Domain.Common.Exceptions;
 using SkiaSharp;
 using SkiaSharp.QrCode;
 using System.Collections.Concurrent;
 
-namespace DocumentOperator.Infrastructure.Services.QrCodeProcessing;
+namespace DocumentService.Infrastructure.Services.QrCodeProcessing;
 
 /// <summary>
 /// Swiss QR Code processor using DevExpress PDF API for image extraction,

DocumentOperator.Infrastructure/Services/StringExtensions.cs

@@ -1,6 +1,6 @@
 using System.Xml.Serialization;
 
-namespace DocumentOperator.Infrastructure.Services;
+namespace DocumentService.Infrastructure.Services;
 
 public static class StringExtensions
 {