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/appsettings.Production.json

@@ -0,0 +1,33 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Warning",
+      "Microsoft.AspNetCore": "Warning",
+      "Microsoft.EntityFrameworkCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*",
+  "MongoDB": {
+    "ConnectionString": "mongodb://localhost:27017",
+    "DatabaseName": "SkyArtShopDB",
+    "Collections": {
+      "Pages": "Pages",
+      "PortfolioCategories": "PortfolioCategories",
+      "PortfolioProjects": "PortfolioProjects",
+      "Products": "Products",
+      "BlogPosts": "BlogPosts",
+      "SiteSettings": "SiteSettings",
+      "MenuItems": "MenuItems",
+      "HomepageSections": "HomepageSections",
+      "Users": "Users"
+    }
+  },
+  "AdminUser": {
+    "Email": "admin@skyartshop.com",
+    "Password": "ChangeThisPassword123!",
+    "Name": "Sky Art Shop Admin"
+  },
+  "ConnectionStrings": {
+    "IdentityConnection": "Data Source=identity.db"
+  }
+}