CUB-33: integrate Moonraker filament usage polling

backend/Program.cs

@@ -1,4 +1,5 @@
 using System.Reflection;
+using System.Net.Http.Headers;
 using Extrudex.API.Filters;
 using Extrudex.API.Hubs;
 using Extrudex.Domain.Interfaces;
@@ -50,6 +51,23 @@ builder.Services.AddSwaggerGen(c =>
 // ── QR Code Generation ──────────────────────────────────────
 builder.Services.AddSingleton<IQrCodeService, QrCodeService>();
 
+// ── Filament Usage Service ──────────────────────────────────
+builder.Services.AddScoped<IFilamentUsageService, FilamentUsageService>();
+
+// ── Moonraker Client ───────────────────────────────────────
+// Named HttpClient for Moonraker API calls with configurable timeout.
+// Poller timeout is driven by MoonrakerPollerOptions.RequestTimeout.
+builder.Services.AddHttpClient<IMoonrakerClient, MoonrakerClient>(client =>
+{
+    client.DefaultRequestHeaders.Accept.Add(
+        new MediaTypeWithQualityHeaderValue("application/json"));
+});
+
+// ── Moonraker Usage Poller (Background Service) ─────────────
+builder.Services.Configure<MoonrakerPollerOptions>(
+    builder.Configuration.GetSection("MoonrakerPoller"));
+builder.Services.AddHostedService<MoonrakerUsagePoller>();
+
 // ── FluentValidation ──────────────────────────────────────
 // Registers all validators from the API assembly into DI.
 builder.Services.AddValidatorsFromAssembly(Assembly.GetExecutingAssembly());