feat: Add Hangfire infrastructure with dynamic storage configuration

- Install Hangfire packages (Core, AspNetCore, SqlServer, InMemory)
- Configure Hangfire in Program.cs with boolean InMemory flag from appsettings
- Add Hangfire dashboard at /hangfire route
- Update appsettings.json with Hangfire:InMemory configuration
- Update launchSettings.json with new launch URL
- Remove obsolete Worker.cs background service

ECMJobRunner.WebCron/appsettings.json

@@ -5,5 +5,14 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
-  "AllowedHosts": "*"
+  "ConnectionStrings": {
+    "SDD-VMP04-SQL17": "Server=SDD-VMP04-SQL17\\DD_DEVELOP01;Database=DD_ECM;User Id=sa;Password=dd;Encrypt=false;TrustServerCertificate=True;"
+  },
+  "AllowedHosts": "*",
+  "Hangfire": {
+    "InMemory": true
+  },
+  "ReC": {
+    "ApiUrl": "http://172.24.12.39:90"
+  }
 }