feat(frontend): Replace React with Blazor frontend

frontend/Program.cs

@@ -0,0 +1,36 @@
+using NimbusFlow.Frontend.Components;
+using NimbusFlow.Frontend.Services;
+
+var builder = WebApplication.CreateBuilder(args);
+
+// Add services to the container.
+builder.Services.AddRazorComponents()
+    .AddInteractiveServerComponents();
+
+// Add HTTP client for backend API communication
+builder.Services.AddHttpClient<IApiService, ApiService>(client =>
+{
+    client.BaseAddress = new Uri("http://localhost:8000/api/"); // Python backend API endpoint
+});
+
+builder.Services.AddScoped<IApiService, ApiService>();
+
+var app = builder.Build();
+
+// Configure the HTTP request pipeline.
+if (!app.Environment.IsDevelopment())
+{
+    app.UseExceptionHandler("/Error", createScopeForErrors: true);
+    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
+    app.UseHsts();
+}
+
+app.UseHttpsRedirection();
+
+app.UseStaticFiles();
+app.UseAntiforgery();
+
+app.MapRazorComponents<App>()
+    .AddInteractiveServerRenderMode();
+
+app.Run();