feat: Add Hangfire cronjob system with web dashboard, Windows Service support, and Serilog file/console logging

- Add Hangfire packages (AspNetCore, Core, InMemory, SqlServer) with configurable storage (InMemory vs SQL Server)
- Configure Hangfire dashboard at /hangfire with AllowAllDashboardAuthorizationFilter (no auth for development)
- Add Microsoft.Extensions.Hosting.WindowsServices package with conditional UseWindowsService() based on HostingOptions:UseWindowsService config
- Create ProfileManager BackgroundService with IServiceScopeFactory for scoped service resolution per iteration
- Create AllowAllDashboardAuthorizationFilter for Hangfire dashboard access
- Create DtoExtensions with JobId() and ToJob() helper methods
- Configure Serilog with file sink (Production: Logs/log-.txt, daily rolling, 30 day retention) and console sink (Development)
- Add Serilog enrichers: FromLogContext, WithMachineName, WithThreadId
- Update appsettings.json with Hangfire:InMemory flag, HostingOptions:UseWindowsService flag, and Serilog configuration
- Create appsettings.Development.json with console-specific Serilog configuration

ECMJobRunner.WebCron/Program.cs

@@ -4,14 +4,30 @@ using ECMJobRunner.WebCron;
 using Hangfire;
 using Hangfire.SqlServer;
 using Microsoft.Data.SqlClient;
+using Serilog;
 
-var builder = WebApplication.CreateBuilder(args);
+// Configure Serilog from appsettings.json
+Log.Logger = new LoggerConfiguration()
+    .ReadFrom.Configuration(new ConfigurationBuilder()
+        .AddJsonFile("appsettings.json")
+        .AddJsonFile($"appsettings.{Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT") ?? "Production"}.json", optional: true)
+        .Build())
+    .CreateLogger();
 
-// Configure Windows Service hosting if enabled
-if (builder.Configuration.GetValue<bool>("HostingOptions:UseWindowsService"))
+try
 {
-    builder.Host.UseWindowsService();
-}
+    Log.Information("Starting ECMJobRunner.WebCron application");
+
+    var builder = WebApplication.CreateBuilder(args);
+
+    // Use Serilog for logging
+    builder.Host.UseSerilog();
+
+    // Configure Windows Service hosting if enabled
+    if (builder.Configuration.GetValue<bool>("HostingOptions:UseWindowsService"))
+    {
+        builder.Host.UseWindowsService();
+    }
 
 // Add services to the container.
 builder.Services.AddControllers();
@@ -84,3 +100,12 @@ app.UseHangfireDashboard("/hangfire", new DashboardOptions
 app.MapControllers();
 
 app.Run();
+}
+catch (Exception ex)
+{
+    Log.Fatal(ex, "Application terminated unexpectedly");
+}
+finally
+{
+    Log.CloseAndFlush();
+}