implement Clean Architecture and user authentication

- Add LoopFit.Domain with entities (ApplicationUser, Workout, CalorieEntry, VitalData), enums (WorkoutType), and interfaces (IJwtTokenGenerator, IUserRepository, IWorkoutRepository)
- Add LoopFit.Application with auth DTOs, service interfaces, and DI setup
- Add LoopFit.Infrastructure with EF Core DbContext (PostgreSQL), ASP.NET Core Identity, JWT token generation, and repository implementations
- Add AuthController with register/login/me endpoints and JWT Bearer auth
- Add MAUI auth services (AuthService, TokenStorageService) and Login/Register Blazor pages

LoopFit.Web/Program.cs

@@ -1,36 +1,60 @@
+using Microsoft.AspNetCore.Authentication.JwtBearer;
+using Microsoft.IdentityModel.Tokens;
+using System.Text;
+using LoopFit.Application;
+using LoopFit.Infrastructure;
 using LoopFit.Web.Components;
-using LoopFit.Shared.Services;
-using LoopFit.Web.Services;
 
 var builder = WebApplication.CreateBuilder(args);
 
-// Add services to the container.
+builder.Services.AddInfrastructure(builder.Configuration);
+builder.Services.AddApplication();
+
+builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
+    .AddJwtBearer(options =>
+    {
+        var jwtSettings = builder.Configuration.GetSection("Jwt");
+        options.TokenValidationParameters = new TokenValidationParameters
+        {
+            ValidateIssuer = true,
+            ValidateAudience = true,
+            ValidateLifetime = true,
+            ValidateIssuerSigningKey = true,
+            ValidIssuer = jwtSettings["Issuer"],
+            ValidAudience = jwtSettings["Audience"],
+            IssuerSigningKey = new SymmetricSecurityKey(
+                Encoding.UTF8.GetBytes(jwtSettings["Key"]!))
+        };
+    });
+
+builder.Services.AddAuthorization();
+
 builder.Services.AddRazorComponents()
     .AddInteractiveServerComponents();
 
-// Add device-specific services used by the LoopFit.Shared project
-builder.Services.AddSingleton<IFormFactor, FormFactor>();
+builder.Services.AddControllers();
 
 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.UseStatusCodePagesWithReExecute("/not-found", createScopeForStatusCodePages: true);
 app.UseHttpsRedirection();
 
+app.UseStaticFiles();
 app.UseAntiforgery();
 
-app.MapStaticAssets();
+app.UseAuthentication();
+app.UseAuthorization();
+
+app.MapControllers();
 
 app.MapRazorComponents<App>()
     .AddInteractiveServerRenderMode()
-    .AddAdditionalAssemblies(
-        typeof(LoopFit.Shared._Imports).Assembly);
+    .AddAdditionalAssemblies(typeof(App).Assembly);
 
-app.Run();
+app.Run();