feat: implement admin dashboard with authentication, session monitoring, and user management UI

radiuscontroller/Components/Layout/MainLayout.razor

@@ -45,10 +45,18 @@
 </div>
 
 @code {
-    protected override async Task OnInitializedAsync()
+    protected override void OnInitialized()
     {
         AuthService.OnAuthStateChanged += StateHasChanged;
+    }
+
+    protected override async Task OnAfterRenderAsync(bool firstRender)
+    {
+        if (firstRender)
+        {
             await AuthService.InitializeAsync();
+            StateHasChanged();
+        }
     }
 
     private async Task LogoutAdmin()

radiuscontroller/Components/Pages/Admin/Dashboard.razor

@@ -23,9 +23,14 @@
                     Manage guest bandwidth caps, session durations, and monitor live PostgreSQL accounting.
                 </p>
             </div>
+            <div style="display: flex; gap: 0.5rem; align-items: center;">
                 <button class="btn-sm btn-secondary" @onclick="RefreshData" disabled="@isLoading">
                     <i class="bi bi-arrow-clockwise"></i> Refresh Data
                 </button>
+                <button class="btn-sm btn-danger" @onclick="LogoutAdmin">
+                    <i class="bi bi-box-arrow-right"></i> Logout (@AuthService.CurrentAdminUsername)
+                </button>
+            </div>
         </div>
 
         @if (notificationMessage != null)
@@ -196,7 +201,7 @@
                                                     <i class="bi bi-slash-circle"></i>
                                                 </button>
                                             }
-                                            <button class="btn-sm btn-secondary" style="color: var(--accent-rose);" title="Delete User" @onclick="() => DeleteUser(user.ProfileId)">
+                                            <button class="btn-sm btn-secondary" style="color: var(--accent-rose);" title="Delete User" @onclick="() => OpenDeleteModal(user)">
                                                 <i class="bi bi-trash"></i>
                                             </button>
                                         </div>
@@ -364,6 +369,37 @@
                 </div>
             </div>
         }
+
+        <!-- Delete Confirmation Modal Overlay -->
+        @if (selectedUserForDelete != null)
+        {
+            <div style="position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.75); backdrop-filter: blur(8px); display: flex; align-items: center; justify-content: center; z-index: 1000; padding: 1rem;">
+                <div class="glass-card" style="max-width: 480px; width: 100%; border-color: rgba(244, 63, 94, 0.4);">
+                    <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem;">
+                        <h3 style="font-size: 1.25rem; font-weight: 700; color: var(--accent-rose);">
+                            <i class="bi bi-exclamation-triangle-fill"></i> Delete Guest Account
+                        </h3>
+                        <button class="btn-sm btn-secondary" @onclick="() => selectedUserForDelete = null">
+                            <i class="bi bi-x-lg"></i>
+                        </button>
+                    </div>
+
+                    <p style="color: var(--text-muted); font-size: 0.95rem; margin-bottom: 1rem;">
+                        Are you sure you want to permanently delete guest account <strong style="color: var(--text-primary);">@selectedUserForDelete.GuestName</strong> (<code style="color: var(--accent-teal);">@selectedUserForDelete.Username</code>)?
+                    </p>
+                    <p style="color: var(--text-dim); font-size: 0.825rem; margin-bottom: 1.5rem;">
+                        This will remove their RADIUS credentials from <code style="color: var(--accent-teal);">radcheck</code> and <code style="color: var(--accent-teal);">radreply</code> tables. This action cannot be undone.
+                    </p>
+
+                    <div style="display: flex; gap: 0.75rem; justify-content: flex-end;">
+                        <button class="btn-sm btn-secondary" @onclick="() => selectedUserForDelete = null">Cancel</button>
+                        <button class="btn-sm btn-danger" style="padding: 0.5rem 1.25rem;" @onclick="ConfirmDeleteUser">
+                            <i class="bi bi-trash-fill"></i> Delete User
+                        </button>
+                    </div>
+                </div>
+            </div>
+        }
     }
 </div>
 
@@ -385,7 +421,11 @@
     private long editModalDataLimit;
     private string editModalNewPassword = string.Empty;
 
-    protected override async Task OnInitializedAsync()
+    private UserUsageDto? selectedUserForDelete;
+
+    protected override async Task OnAfterRenderAsync(bool firstRender)
+    {
+        if (firstRender)
         {
             await AuthService.InitializeAsync();
             if (!AuthService.IsAuthenticated)
@@ -395,6 +435,14 @@
             }
 
             await LoadDataAsync();
+            StateHasChanged();
+        }
+    }
+
+    private async Task LogoutAdmin()
+    {
+        await AuthService.LogoutAsync();
+        NavManager.NavigateTo("/admin/login");
     }
 
     private async Task LoadDataAsync()
@@ -495,13 +543,23 @@
         }
     }
 
-    private async Task DeleteUser(int profileId)
+    private void OpenDeleteModal(UserUsageDto user)
     {
+        selectedUserForDelete = user;
+    }
+
+    private async Task ConfirmDeleteUser()
+    {
+        if (selectedUserForDelete == null) return;
+
+        int profileId = selectedUserForDelete.ProfileId;
+        selectedUserForDelete = null;
+
         try
         {
             await RadiusService.DeleteUserAsync(profileId);
             await LoadDataAsync();
-            ShowNotification("User deleted.");
+            ShowNotification("User account deleted successfully.");
         }
         catch (Exception ex)
         {

radiuscontroller/Components/Pages/Admin/Login.razor

@@ -143,7 +143,11 @@
     private bool isSubmitting = false;
     private string errorMessage = string.Empty;
 
-    protected override async Task OnInitializedAsync()
+    protected override async Task OnAfterRenderAsync(bool firstRender)
+    {
+        if (firstRender)
+        {
+            try
             {
                 await AuthService.InitializeAsync();
                 if (AuthService.IsAuthenticated)
@@ -152,8 +156,6 @@
                     return;
                 }
 
-        try
-        {
                 isFirstRun = !await AuthService.HasAnyAdminAsync();
             }
             catch
@@ -163,6 +165,8 @@
             finally
             {
                 isCheckingFirstRun = false;
+                StateHasChanged();
+            }
         }
     }