Fix admin route access and backend configuration

- Added /admin redirect to login page in nginx config
- Fixed backend server.js route ordering for proper admin handling
- Updated authentication middleware and routes
- Added user management routes
- Configured PostgreSQL integration
- Updated environment configuration

Views/AdminMenu/Index.cshtml

@@ -0,0 +1,86 @@
+@model List<SkyArtShop.Models.MenuItem>
+@{
+    Layout = "~/Views/Shared/_AdminLayout.cshtml";
+    ViewData["Title"] = "Manage Menu";
+}
+
+<div class="d-flex justify-content-between align-items-center mb-4">
+    <h2>Menu Items</h2>
+    <div>
+        <form method="post" action="/admin/menu/reseed" style="display:inline;" onsubmit="return confirm('This will delete all existing menu items and create new ones. Continue?')">
+            <button type="submit" class="btn btn-warning">Reseed Menu</button>
+        </form>
+        <a href="/admin/menu/create" class="btn btn-primary">Add Menu Item</a>
+    </div>
+</div>
+
+@if (TempData["SuccessMessage"] != null)
+{
+    <div class="alert alert-success">@TempData["SuccessMessage"]</div>
+}
+
+<div class="card">
+    <div class="card-body">
+        <table class="table">
+            <thead>
+                <tr>
+                    <th>Order</th>
+                    <th>Label</th>
+                    <th>URL</th>
+                    <th>Status</th>
+                    <th>Navbar</th>
+                    <th>Dropdown</th>
+                    <th>New Tab</th>
+                    <th>Actions</th>
+                </tr>
+            </thead>
+            <tbody>
+                @foreach (var item in Model)
+                {
+                    <tr>
+                        <td>@item.DisplayOrder</td>
+                        <td>@item.Label</td>
+                        <td>@item.Url</td>
+                        <td>
+                            @if (item.IsActive)
+                            {
+                                <span class="badge bg-success"><i class="bi bi-check-circle-fill"></i> Active</span>
+                            }
+                            else
+                            {
+                                <span class="badge bg-danger"><i class="bi bi-x-circle-fill"></i> Inactive</span>
+                            }
+                        </td>
+                        <td>
+                            @if (item.ShowInNavbar)
+                            {
+                                <span class="badge bg-primary">Yes</span>
+                            }
+                            else
+                            {
+                                <span class="badge bg-light text-dark">No</span>
+                            }
+                        </td>
+                        <td>
+                            @if (item.ShowInDropdown)
+                            {
+                                <span class="badge bg-info">Yes</span>
+                            }
+                            else
+                            {
+                                <span class="badge bg-light text-dark">No</span>
+                            }
+                        </td>
+                        <td>@(item.OpenInNewTab ? "Yes" : "No")</td>
+                        <td>
+                            <a href="/admin/menu/edit/@item.Id" class="btn btn-sm btn-warning">Edit</a>
+                            <form method="post" action="/admin/menu/delete/@item.Id" style="display:inline;" onsubmit="return confirm('Delete this menu item?')">
+                                <button type="submit" class="btn btn-sm btn-danger">Delete</button>
+                            </form>
+                        </td>
+                    </tr>
+                }
+            </tbody>
+        </table>
+    </div>
+</div>