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.

Components/Pages/Login.razor

@@ -0,0 +1,46 @@
+@page "/login"
+@attribute [AllowAnonymous]
+
+@using Microsoft.AspNetCore.Authorization
+@using Microsoft.AspNetCore.Components
+
+<PageTitle>Login</PageTitle>
+
+<h1>Login</h1>
+
+@if (!string.IsNullOrWhiteSpace(Error))
+{
+    <div class="alert alert-danger" role="alert">@Error</div>
+}
+
+<form method="post" action="/login" class="d-flex flex-column gap-3" style="max-width: 420px;">
+    <div>
+        <label for="email" class="form-label">Email</label>
+        <input id="email" name="email" value="@Email" autocomplete="username" class="form-control" required />
+    </div>
+
+    <div>
+        <label for="password" class="form-label">Password</label>
+        <input id="password" name="password" type="password" autocomplete="current-password" class="form-control" required />
+    </div>
+
+    <input type="hidden" name="returnUrl" value="@SafeReturnUrl" />
+
+    <button type="submit" class="btn btn-primary">Sign in</button>
+</form>
+
+@code {
+    [SupplyParameterFromQuery]
+    public string? ReturnUrl { get; set; }
+
+    [SupplyParameterFromQuery]
+    public string? Error { get; set; }
+
+    [SupplyParameterFromQuery]
+    public string? Email { get; set; }
+
+    private string SafeReturnUrl =>
+        string.IsNullOrWhiteSpace(ReturnUrl) || !Uri.IsWellFormedUriString(ReturnUrl, UriKind.Relative)
+            ? "/"
+            : ReturnUrl;
+}