Added auth flow

OnProfNext.Client/Pages/Login.razor

@@ -0,0 +1,57 @@
+@page "/login"
+@using OnProfNext.Shared.Models
+@inject HttpClient Http
+@inject NavigationManager Nav
+@inject IJSRuntime JS
+
+<h3>Anmeldung</h3>
+
+@if (error is not null)
+{
+    <div class="alert alert-danger">@error</div>
+}
+
+<EditForm Model="login" OnValidSubmit="HandleLogin">
+    <DataAnnotationsValidator />
+    <ValidationSummary />
+
+    <div class="mb-3">
+        <label>Benutzername</label>
+        <InputText class="form-control" @bind-Value="login.Username" />
+    </div>
+
+    <div class="mb-3">
+        <label>Passwort</label>
+        <InputText type="password" class="form-control" @bind-Value="login.Password" />
+    </div>
+
+    <button type="submit" class="btn btn-primary w-100">Login</button>
+</EditForm>
+
+
+@code {
+    private LoginRequest login = new();
+    private string? error;
+
+    private async Task HandleLogin()
+    {
+        try
+        {
+            var response = await Http.PostAsJsonAsync("api/auth/login", login);
+            if (!response.IsSuccessStatusCode)
+            {
+                error = "Anmeldung fehlgeschlagen.";
+                return;
+            }
+
+            var result = await response.Content.ReadFromJsonAsync<LoginResponse>();
+            await JS.InvokeVoidAsync("localStorage.setItem", "authToken", result!.Token);
+
+            Nav.NavigateTo("/users");
+        }
+        catch
+        {
+            error = "Server nicht erreichbar.";
+        }
+    }
+}

OnProfNext.Client/Pages/Users.razor

@@ -2,6 +2,8 @@
 @using OnProfNext.Client.Services
 @using OnProfNext.Shared.Models
 @inject UserApiService UserService
+@inject AuthService AuthService
+@inject NavigationManager Nav
 
 <h3 class="mb-3">Benutzerübersicht</h3>
 
@@ -147,6 +149,15 @@ else
 
     protected override async Task OnInitializedAsync()
     {
+        var isLoggedIn = await AuthService.IsLoggedInAsync();
+        if (!isLoggedIn)
+        {
+            Nav.NavigateTo("/login", forceLoad: true);
+            return;
+        }
+
+
+
         var result = await UserService.GetUsersAsync();
 
         if (!result.Success)