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

Sky_Art_shop/Views/AdminPages/Index.cshtml

@@ -0,0 +1,43 @@
+@model List<SkyArtShop.Models.Page>
+@{
+    Layout = "~/Views/Shared/_AdminLayout.cshtml";
+    ViewData["Title"] = "Pages";
+}
+<div class="card">
+    <div class="card-body d-flex justify-content-between align-items-center">
+        <h5 class="mb-0">Pages</h5>
+        <a class="btn btn-primary" href="/admin/pages/create">Create Page</a>
+    </div>
+</div>
+<div class="card">
+    <div class="card-body">
+        <table class="table table-striped">
+            <thead>
+            <tr>
+                <th>Name</th>
+                <th>Slug</th>
+                <th>Active</th>
+                <th>Updated</th>
+                <th>Actions</th>
+            </tr>
+            </thead>
+            <tbody>
+            @foreach (var p in Model)
+            {
+                <tr>
+                    <td>@p.PageName</td>
+                    <td>@p.PageSlug</td>
+                    <td>@(p.IsActive ? "Yes" : "No")</td>
+                    <td>@p.UpdatedAt.ToString("MMM dd, yyyy")</td>
+                    <td>
+                        <a class="btn btn-sm btn-secondary" href="/admin/pages/edit/@p.Id">Edit</a>
+                        <form method="post" action="/admin/pages/delete/@p.Id" class="d-inline" onsubmit="return confirm('Delete this page?');">
+                            <button class="btn btn-sm btn-danger" type="submit">Delete</button>
+                        </form>
+                    </td>
+                </tr>
+            }
+            </tbody>
+        </table>
+    </div>
+</div>