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

Models/Order.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using MongoDB.Bson;
+using MongoDB.Bson.Serialization.Attributes;
+
+namespace SkyArtShop.Models;
+
+public class Order
+{
+	[BsonId]
+	[BsonRepresentation(BsonType.ObjectId)]
+	public string? Id { get; set; }
+
+	public string CustomerEmail { get; set; } = string.Empty;
+
+	public string CustomerName { get; set; } = string.Empty;
+
+	public List<OrderItem> Items { get; set; } = new List<OrderItem>();
+
+	public decimal TotalAmount { get; set; }
+
+	public string Status { get; set; } = "Pending";
+
+	public DateTime OrderDate { get; set; } = DateTime.UtcNow;
+
+	public DateTime? CompletedDate { get; set; }
+}