Refactor authentication system to use MongoDB

- Removed Entity Framework Core identity schema and related migrations.
- Introduced MongoDB-based authentication service with user seeding functionality.
- Updated Program.cs to configure authentication and authorization using cookies.
- Created new Login.razor component for user login interface.
- Added RedirectToLogin component for handling unauthorized access.
- Updated Dockerfile and docker-compose files for development and production environments.
- Removed SQLite connection strings and related configurations.
- Added MongoDB connection settings in appsettings.json and Docker configurations.
- Implemented IMongoAuthService interface and MongoAuthService class for user management.
- Created MongoAuthUser model for MongoDB user representation.

Services/Auth/MongoAuthService.cs

@@ -0,0 +1,77 @@
+using Microsoft.AspNetCore.Identity;
+using Microsoft.Extensions.Options;
+using MongoDB.Driver;
+using WorkTracker.Configuration;
+
+namespace WorkTracker.Services.Auth;
+
+public sealed class MongoAuthService : IMongoAuthService
+{
+    private const string UsersCollectionName = "users";
+
+    private readonly IMongoCollection<MongoAuthUser> users;
+    private readonly PasswordHasher<MongoAuthUser> passwordHasher = new();
+    private readonly IOptions<SingleUserOptions> options;
+    private readonly ILogger<MongoAuthService> logger;
+
+    public MongoAuthService(
+        IMongoDatabase database,
+        IOptions<SingleUserOptions> options,
+        ILogger<MongoAuthService> logger)
+    {
+        users = database.GetCollection<MongoAuthUser>(UsersCollectionName);
+        this.options = options;
+        this.logger = logger;
+    }
+
+    public async Task EnsureSeedUserAsync(CancellationToken cancellationToken)
+    {
+        var email = options.Value.Email.Trim();
+        var normalizedEmail = NormalizeEmail(email);
+
+        var existingUser = await users
+            .Find(x => x.EmailNormalized == normalizedEmail)
+            .FirstOrDefaultAsync(cancellationToken);
+
+        if (existingUser is not null)
+        {
+            return;
+        }
+
+        var user = new MongoAuthUser
+        {
+            Email = email,
+            EmailNormalized = normalizedEmail,
+            PasswordHash = string.Empty
+        };
+
+        var passwordHash = passwordHasher.HashPassword(user, options.Value.Password);
+        var userToCreate = new MongoAuthUser
+        {
+            Email = email,
+            EmailNormalized = normalizedEmail,
+            PasswordHash = passwordHash
+        };
+
+        await users.InsertOneAsync(userToCreate, cancellationToken: cancellationToken);
+        logger.LogInformation("Seeded single user account {Email} in MongoDB", email);
+    }
+
+    public async Task<MongoAuthUser?> ValidateCredentialsAsync(string email, string password, CancellationToken cancellationToken)
+    {
+        var normalizedEmail = NormalizeEmail(email);
+        var user = await users
+            .Find(x => x.EmailNormalized == normalizedEmail)
+            .FirstOrDefaultAsync(cancellationToken);
+
+        if (user is null)
+        {
+            return null;
+        }
+
+        var result = passwordHasher.VerifyHashedPassword(user, user.PasswordHash, password);
+        return result == PasswordVerificationResult.Failed ? null : user;
+    }
+
+    private static string NormalizeEmail(string email) => email.Trim().ToUpperInvariant();
+}