Add CommandDotNet and update logging configuration

- Included `CommandDotNet.Execution` namespace in `Program.cs`.
- Adjusted logging setup to clear providers and use NLog only in non-development environments.
- Added `AddHttpContextAccessor` to the service collection.
- Introduced a new `ConnectionStrings` section in `appsettings.Development.json` with a database connection string.

EnvelopeGenerator.Web/appsettings.Development.json

@@ -7,5 +7,8 @@
     }
   },
   "AdminPassword": "dd",
-  "UseCSPInDev": false
+  "UseCSPInDev": false,
+  "ConnectionStrings": {
+    "Default": "Server=sDD-VMP04-SQL19\\CURSORAG;Database=DD_ECM;User Id=sa;Password=dd;Encrypt=false;TrustServerCertificate=True;"
+  }
 }