feat(CUB-8): Create background service for Moonraker mapping

backend/Program.cs

@@ -92,6 +92,12 @@ builder.Services.AddHttpClient<IMoonrakerClient, MoonrakerClient>(client =>
 builder.Services.AddScoped<IFilamentUsageSyncService, FilamentUsageSyncService>();
 builder.Services.AddHostedService<FilamentUsageSyncJob>();
 
+// ── Moonraker Printer Sync (Background Service) ──────────
+builder.Services.Configure<MoonrakerPrinterSyncOptions>(
+    builder.Configuration.GetSection(MoonrakerPrinterSyncOptions.SectionName));
+builder.Services.AddScoped<IMoonrakerPrinterSyncService, MoonrakerPrinterSyncService>();
+builder.Services.AddHostedService<MoonrakerPrinterSyncJob>();
+
 // ── Health Checks ───────────────────────────────────────────
 builder.Services.AddHealthChecks()
     .AddNpgSql(connectionString);