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.API/appsettings.json

@@ -8,12 +8,12 @@
   "AllowedHosts": "*",
 
   "Application": {
-    "LogDirectory": "E:\\LogFiles\\Digital Data\\DocumentOperator.API"
+    "LogDirectory": "E:\\LogFiles\\Digital Data\\DocumentService.API"
   },
 
   "SwaggerSettings": {
     "EnableInProduction": true,
-    "Title": "DocumentOperator API",
+    "Title": "DocumentService API",
     "Version": "v1",
     "Description": "PDF document processing service using DevExpress"
   },
@@ -45,7 +45,7 @@
       {
         "Name": "SQLite",
         "Args": {
-          "sqliteDbPath": "E:\\LogFiles\\Digital Data\\DocumentOperator.API\\logs.db",
+          "sqliteDbPath": "E:\\LogFiles\\Digital Data\\DocumentService.API\\logs.db",
           "tableName": "Logs",
           "storeTimestampInUtc": true
         }
@@ -54,8 +54,8 @@
     "Enrich": [ "FromLogContext", "WithMachineName", "WithThreadId" ]
   },
 
-  "DocumentOperatorSettings": {
-    "TempFolderPath": "C:\\Temp\\DocumentOperator",
+  "DocumentServiceSettings": {
+    "TempFolderPath": "C:\\Temp\\DocumentService",
     "TempFileRetentionHours": 24,
     "MaxPdfSizeMB": 50,
     "EnableDetailedLogging": true
@@ -79,7 +79,7 @@
 
   "RedisSettings": {
     "ConnectionString": "localhost:6379",
-    "InstanceName": "DocumentOperator:",
+    "InstanceName": "DocumentService:",
     "CacheExpirationMinutes": 60
   },