refactor: replace QuartzHostedService with QuartzServer and remove unnecessary using

- Replaced `AddQuartzHostedService` with `AddQuartzServer` for better Quartz integration.
- Removed `Microsoft.Extensions.Options` using as it was unused.
- Updated Quartz job naming to remove GUID and simplify identity.
- Minor code cleanup in using statements and regions.

EnvelopeGenerator.Finalizer/Properties/launchSettings.json

@@ -22,8 +22,8 @@
     "https": {
       "commandName": "Project",
       "dotnetRunMessages": true,
-      "launchBrowser": false,
-      "launchUrl": "swagger",
+      "launchBrowser": true,
+      "launchUrl": "quartz",
       "applicationUrl": "https://localhost:7141;http://localhost:5010",
       "environmentVariables": {
         "ASPNETCORE_ENVIRONMENT": "Development"