Migrate legacy VB.NET service to modern C# Worker

Migrated the legacy VB.NET Windows Service to a modern C# Worker Service targeting .NET Framework 4.6.2. Key changes include:

- Added `Microsoft.Extensions.Hosting.WindowsServices`, `NLog`, and `Quartz` for logging and scheduling.
- Introduced `LogConfigFactory` to bridge `ServiceConfig` and `LogConfig` for Quartz jobs.
- Rewrote `Worker` to handle the full service lifecycle, including database connection, temp file management, and scheduler initialization.
- Implemented `SchedulerFinishEnvelope` and `SchedulerEnvelopeTaskApi` for Quartz job scheduling.
- Created `TempFiles` for service-level temp file management.
- Configured `NLog` for file and console logging.
- Updated `appsettings.json` for connection strings and service-specific configuration.
- Replaced legacy `ProjectInstaller` with `AddWindowsService()` for SCM integration.

EnvelopeGenerator.Service/appsettings.json

@@ -1,8 +1,24 @@
 {
-  "Logging": {
-    "LogLevel": {
-      "Default": "Information",
-      "Microsoft.Hosting.Lifetime": "Information"
+  "ConnectionStrings": {
+    "Default": "Server=SDD-VMP04-SQL17\\DD_DEVELOP01;Database=DD_ECM;User Id=sa;Password=dd;Encrypt=false;TrustServerCertificate=True;"
+  },
+  "ServiceConfig": {
+    "Debug": false,
+    "IntervalInMin": 1,
+    "PDFBurnerParams": {
+      "IgnoredLabels": [ "Date", "Datum", "ZIP", "PLZ", "Place", "Ort", "Position", "Stellung" ],
+      "TopMargin": 0.1,
+      "YOffset": -0.3,
+      "FontName": "Arial",
+      "FontSize": 8,
+      "FontStyle": 2,
+      "TruncationSuffix": "..",
+      "TextMaxWidths": {
+        "position": 1.41,
+        "city": 1.41,
+        "date": 2.0
+      }
     }
   }
 }
+