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/Page/View.cshtml

@@ -0,0 +1,23 @@
+@model SkyArtShop.Models.Page
+@{
+    ViewData["Title"] = Model.Title ?? Model.PageName;
+    ViewData["MetaDescription"] = Model.MetaDescription;
+}
+
+<section class="page-hero">
+    <div class="container">
+        <h1>@(Model.Title ?? Model.PageName)</h1>
+        @if (!string.IsNullOrEmpty(Model.Subtitle))
+        {
+            <p class="hero-subtitle">@Model.Subtitle</p>
+        }
+    </div>
+</section>
+
+<section class="page-content">
+    <div class="container">
+        <div class="content-wrapper">
+            @Html.Raw(Model.Content)
+        </div>
+    </div>
+</section>