diff --git a/EnvelopeGenerator.WebUI/EnvelopeGenerator.WebUI.Client/Program.cs b/EnvelopeGenerator.WebUI/EnvelopeGenerator.WebUI.Client/Program.cs
index 519269f2..496f0f1a 100644
--- a/EnvelopeGenerator.WebUI/EnvelopeGenerator.WebUI.Client/Program.cs
+++ b/EnvelopeGenerator.WebUI/EnvelopeGenerator.WebUI.Client/Program.cs
@@ -1,5 +1,55 @@
 using Microsoft.AspNetCore.Components.WebAssembly.Hosting;
+using EnvelopeGenerator.WebUI.Client.Services;
+using EnvelopeGenerator.WebUI.Client.Options;
+using DevExpress.Blazor.Reporting;
+using DevExpress.XtraReports.Web.Extensions;
+using DevExpress.DataAccess.Web;
+using DevExpress.XtraReports.Services;
 
 var builder = WebAssemblyHostBuilder.CreateDefault(args);
 
-await builder.Build().RunAsync();
+// HTTP Client (uses WebUI's YARP proxy)
+builder.Services.AddScoped(sp => new HttpClient { 
+    BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) 
+});
+
+// Configuration Options
+builder.Services.Configure<ApiOptions>(opts =>
+    builder.Configuration.GetSection(ApiOptions.SectionName).Bind(opts));
+builder.Services.Configure<PdfViewerOptions>(opts =>
+    builder.Configuration.GetSection(PdfViewerOptions.SectionName).Bind(opts));
+
+// Business Services
+builder.Services.AddScoped<DocumentService>();
+builder.Services.AddScoped<AuthService>();
+builder.Services.AddScoped<AnnotationService>();
+builder.Services.AddScoped<EnvelopeReceiverService>();
+builder.Services.AddScoped<SignatureService>();
+builder.Services.AddScoped<SignatureCacheService>();
+builder.Services.AddSingleton<AppVersionService>();
+
+// DevExpress WASM
+builder.Services.AddDevExpressWebAssemblyBlazorPdfViewer();
+builder.Services.AddDevExpressWebAssemblyBlazorReportViewer();
+
+builder.Services.AddDevExpressBlazorReportingWebAssembly(configure => {
+    configure.UseDevelopmentMode();
+});
+
+// Reporting Services
+builder.Services.AddScoped<IDataSourceWizardJsonConnectionStorage, CustomDataSourceWizardJsonDataConnectionStorage>();
+builder.Services.AddScoped<IJsonDataConnectionProviderFactory, CustomJsonDataConnectionProviderFactory>();
+builder.Services.AddScoped<IObjectDataSourceWizardTypeProvider, ObjectDataSourceWizardCustomTypeProvider>();
+
+DevExpress.Utils.DeserializationSettings.RegisterTrustedClass(typeof(EnvelopeGenerator.WebUI.Client.Data.DataItemList));
+DevExpress.Utils.DeserializationSettings.RegisterTrustedClass(typeof(EnvelopeGenerator.WebUI.Client.PredefinedReports.Report));
+
+builder.Services.AddSingleton<InMemoryReportStorageWebExtension>();
+builder.Services.AddSingleton<ReportStorageWebExtension>(sp => sp.GetRequiredService<InMemoryReportStorageWebExtension>());
+builder.Services.AddScoped<IReportProviderAsync, CustomReportProvider>();
+
+ReportStorageWebExtension.RegisterExtensionGlobal(new InMemoryReportStorageWebExtension());
+
+var host = builder.Build();
+await FontLoader.LoadFonts(host.Services.GetRequiredService<HttpClient>(), new List<string> { "opensans.ttf" });
+await host.RunAsync();
diff --git a/EnvelopeGenerator.WebUI/EnvelopeGenerator.WebUI.Client/_Imports.razor b/EnvelopeGenerator.WebUI/EnvelopeGenerator.WebUI.Client/_Imports.razor
index 9b33eab0..287f87f1 100644
--- a/EnvelopeGenerator.WebUI/EnvelopeGenerator.WebUI.Client/_Imports.razor
+++ b/EnvelopeGenerator.WebUI/EnvelopeGenerator.WebUI.Client/_Imports.razor
@@ -5,5 +5,12 @@
 @using Microsoft.AspNetCore.Components.Web
 @using static Microsoft.AspNetCore.Components.Web.RenderMode
 @using Microsoft.AspNetCore.Components.Web.Virtualization
+@using Microsoft.AspNetCore.Components.WebAssembly.Http
 @using Microsoft.JSInterop
 @using EnvelopeGenerator.WebUI.Client
+@using EnvelopeGenerator.WebUI.Client.Services
+@using EnvelopeGenerator.WebUI.Client.Models
+@using EnvelopeGenerator.WebUI.Client.Options
+@using DevExpress.Blazor
+@using DevExpress.Blazor.PdfViewer
+@using DevExpress.Blazor.Reporting
diff --git a/EnvelopeGenerator.WebUI/EnvelopeGenerator.WebUI/Program.cs b/EnvelopeGenerator.WebUI/EnvelopeGenerator.WebUI/Program.cs
index 19799648..d96b7f29 100644
--- a/EnvelopeGenerator.WebUI/EnvelopeGenerator.WebUI/Program.cs
+++ b/EnvelopeGenerator.WebUI/EnvelopeGenerator.WebUI/Program.cs
@@ -18,13 +18,12 @@ builder.Services.AddReverseProxy()
 // DevExpress Server-Side Services (CRITICAL for DxPdfViewer)
 builder.Services.AddDevExpressBlazor(configure => configure.BootstrapVersion = BootstrapVersion.v5);
 builder.Services.AddDevExpressServerSideBlazorPdfViewer();
-// builder.Services.AddDevExpressBlazorReportViewer();  // Will be enabled after Options migration
 
-// Configuration Options (will be enabled in Phase 5 after Options migration)
-// builder.Services.Configure<EnvelopeGenerator.WebUI.Client.Options.ApiOptions>(
-//     builder.Configuration.GetSection("ApiOptions"));
-// builder.Services.Configure<EnvelopeGenerator.WebUI.Client.Options.PdfViewerOptions>(
-//     builder.Configuration.GetSection("PdfViewerOptions"));
+// Configuration Options
+builder.Services.Configure<EnvelopeGenerator.WebUI.Client.Options.ApiOptions>(
+    builder.Configuration.GetSection("ApiOptions"));
+builder.Services.Configure<EnvelopeGenerator.WebUI.Client.Options.PdfViewerOptions>(
+    builder.Configuration.GetSection("PdfViewerOptions"));
 
 var app = builder.Build();