fix(CUB-56): Restore Program.cs deletion - PR should only add Swashbuckle package

backend/Program.cs

@@ -0,0 +1,38 @@
+using ControlCenter.Api.Data;
+using ControlCenter.Api.Hubs;
+using Microsoft.EntityFrameworkCore;
+
+var builder = WebApplication.CreateBuilder(args);
+
+// Add services to the container.
+builder.Services.AddOpenApi();
+
+// Register SignalR for real-time agent status updates
+builder.Services.AddSignalR();
+
+// Register DbContext with PostgreSQL
+builder.Services.AddDbContext<AppDbContext>(options =>
+{
+    var connectionString = builder.Configuration.GetConnectionString("DefaultConnection")
+        ?? "Host=localhost;Database=control_center;Username=postgres;Password=postgres";
+
+    options.UseNpgsql(connectionString, npgsqlOptions =>
+    {
+        npgsqlOptions.MigrationsAssembly(typeof(AppDbContext).Assembly.FullName);
+    });
+});
+
+var app = builder.Build();
+
+// Configure the HTTP request pipeline.
+if (app.Environment.IsDevelopment())
+{
+    app.MapOpenApi();
+}
+
+app.UseHttpsRedirection();
+
+// Map SignalR hubs
+app.MapHub<AgentStatusHub>("/hubs/agent-status");
+
+app.Run();