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/ViewComponents/NavigationViewComponent.cs

@@ -0,0 +1,40 @@
+using Microsoft.AspNetCore.Mvc;
+using SkyArtShop.Models;
+using SkyArtShop.Services;
+
+namespace SkyArtShop.ViewComponents
+{
+    public class NavigationViewComponent : ViewComponent
+    {
+        private readonly MongoDBService _mongoService;
+
+        public NavigationViewComponent(MongoDBService mongoService)
+        {
+            _mongoService = mongoService;
+        }
+
+        public async Task<IViewComponentResult> InvokeAsync(string location = "navbar")
+        {
+            var menuItems = await _mongoService.GetAllAsync<MenuItem>("MenuItems");
+            
+            if (location == "dropdown")
+            {
+                // For dropdown: must be Active AND ShowInDropdown
+                var dropdownItems = menuItems
+                    .Where(m => m.IsActive && m.ShowInDropdown)
+                    .OrderBy(m => m.DisplayOrder)
+                    .ToList();
+                return View(dropdownItems);
+            }
+            else
+            {
+                // For navbar: must be Active AND ShowInNavbar
+                var navbarItems = menuItems
+                    .Where(m => m.IsActive && m.ShowInNavbar)
+                    .OrderBy(m => m.DisplayOrder)
+                    .ToList();
+                return View(navbarItems);
+            }
+        }
+    }
+}