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/AdminPortfolio/EditCategory.cshtml

@@ -0,0 +1,120 @@
+@model SkyArtShop.Models.PortfolioCategory
+@{
+    Layout = "~/Views/Shared/_AdminLayout.cshtml";
+    ViewData["Title"] = "Edit Category";
+}
+
+<style>
+    .form-check-input[type="checkbox"] {
+        width: 22px;
+        height: 22px;
+        cursor: pointer;
+        border: 2px solid #dee2e6;
+        border-radius: 4px;
+        appearance: none;
+        -webkit-appearance: none;
+        -moz-appearance: none;
+        background-color: white;
+        transition: all 0.2s ease;
+        position: relative;
+    }
+    
+    .form-check-input[type="checkbox"]:checked {
+        background-color: #28a745;
+        border-color: #28a745;
+    }
+    
+    .form-check-input[type="checkbox"]:checked::after {
+        content: '✓';
+        position: absolute;
+        top: 50%;
+        left: 50%;
+        transform: translate(-50%, -50%);
+        color: white;
+        font-size: 16px;
+        font-weight: bold;
+        line-height: 1;
+    }
+    
+    .form-check-input[type="checkbox"]:hover {
+        border-color: #28a745;
+        box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.25);
+    }
+</style>
+
+<div class="card">
+    <div class="card-body">
+        <form method="post">
+            <div asp-validation-summary="All" class="text-danger mb-3"></div>
+            <div class="mb-3">
+                <label class="form-label">Name</label>
+                <input class="form-control" name="Name" value="@Model.Name" />
+            </div>
+            <div class="mb-3">
+                <label class="form-label">Description</label>
+                <textarea class="form-control" id="categoryDescription" name="Description">@Model.Description</textarea>
+            </div>
+            <div class="mb-3">
+                <label class="form-label">Display Order</label>
+                <input type="number" class="form-control" name="DisplayOrder" value="@Model.DisplayOrder" />
+            </div>
+            <div class="form-check mb-3">
+                <input class="form-check-input" type="checkbox" name="IsActive" @(Model.IsActive ? "checked" : "") />
+                <label class="form-check-label">Active</label>
+            </div>
+            <button class="btn btn-primary" type="submit">Save</button>
+            <a class="btn btn-secondary" href="/admin/portfolio/categories">Cancel</a>
+        </form>
+    </div>
+</div>
+
+@section Scripts {
+<script src="https://cdn.ckeditor.com/ckeditor5/40.1.0/classic/ckeditor.js"></script>
+<script>
+let categoryEditor;
+ClassicEditor
+    .create(document.querySelector('#categoryDescription'), {
+        toolbar: {
+            items: [
+                'heading', '|',
+                'bold', 'italic', 'underline', 'strikethrough', '|',
+                'link', 'blockQuote', '|',
+                'bulletedList', 'numberedList', '|',
+                'outdent', 'indent', '|',
+                'alignment', '|',
+                'insertTable', '|',
+                'fontSize', 'fontColor', 'fontBackgroundColor', '|',
+                'removeFormat', '|',
+                'undo', 'redo', '|',
+                'sourceEditing'
+            ],
+            shouldNotGroupWhenFull: true
+        },
+        heading: {
+            options: [
+                { model: 'paragraph', title: 'Paragraph', class: 'ck-heading_paragraph' },
+                { model: 'heading1', view: 'h1', title: 'Heading 1', class: 'ck-heading_heading1' },
+                { model: 'heading2', view: 'h2', title: 'Heading 2', class: 'ck-heading_heading2' },
+                { model: 'heading3', view: 'h3', title: 'Heading 3', class: 'ck-heading_heading3' },
+                { model: 'heading4', view: 'h4', title: 'Heading 4', class: 'ck-heading_heading4' }
+            ]
+        },
+        fontSize: {
+            options: ['small', 'default', 'big']
+        },
+        table: {
+            contentToolbar: ['tableColumn', 'tableRow', 'mergeTableCells']
+        },
+        htmlSupport: {
+            allow: [{ name: /.*/, attributes: true, classes: true, styles: true }]
+        }
+    })
+    .then(editor => {
+        categoryEditor = editor;
+        document.querySelector('form').addEventListener('submit', function(e) {
+            document.querySelector('#categoryDescription').value = categoryEditor.getData();
+        });
+    })
+    .catch(error => { console.error(error); });
+</script>
+}