Configure BTCPay with external nodes via Tor

- Set up Tor container for SOCKS proxy (port 9050)
- Configured Monero wallet with remote onion node
- Bitcoin node continues syncing in background (60% complete)
- Created documentation for wallet configuration steps
- All external connections routed through Tor for privacy

BTCPay requires manual wallet configuration through web interface:
- Bitcoin: Need to add xpub/zpub for watch-only wallet
- Monero: Need to add address and view key

System ready for payment acceptance once wallets configured.

TeleBot/TeleBot/Models/ShoppingCart.cs

@@ -11,10 +11,11 @@ namespace TeleBot.Models
         public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
         public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
         
-        public void AddItem(Guid productId, string productName, decimal price, int quantity = 1)
+        public void AddItem(Guid productId, string productName, decimal price, int quantity = 1, Guid? variationId = null)
         {
-            var existingItem = Items.FirstOrDefault(i => i.ProductId == productId);
-            
+            var existingItem = Items.FirstOrDefault(i =>
+                i.ProductId == productId && i.VariationId == variationId);
+
             if (existingItem != null)
             {
                 existingItem.Quantity += quantity;
@@ -25,6 +26,7 @@ namespace TeleBot.Models
                 var newItem = new CartItem
                 {
                     ProductId = productId,
+                    VariationId = variationId,
                     ProductName = productName,
                     UnitPrice = price,
                     Quantity = quantity
@@ -32,7 +34,7 @@ namespace TeleBot.Models
                 newItem.UpdateTotalPrice(); // Ensure total is calculated after all properties are set
                 Items.Add(newItem);
             }
-            
+
             UpdatedAt = DateTime.UtcNow;
         }
         
@@ -85,6 +87,7 @@ namespace TeleBot.Models
     public class CartItem
     {
         public Guid ProductId { get; set; }
+        public Guid? VariationId { get; set; }
         public string ProductName { get; set; } = string.Empty;
         public int Quantity { get; set; }
         public decimal UnitPrice { get; set; }