Add support page, admin features, and auth hardening.

Rename public affiliate route to /support with localized nav labels, and include affiliate/social/wallpaper admin, 2FA login, and related site updates.

Co-authored-by: Cursor <cursoragent@cursor.com>

Models/classes/SecretProtector.cs

@@ -0,0 +1,54 @@
+using System;
+using System.Text;
+using System.Web.Security;
+
+namespace atakanozbancom.Models.classes
+{
+    public static class SecretProtector
+    {
+        private static readonly string[] Purposes = { "atakanozbancom.TotpSecret.v1" };
+
+        public static string Protect(string plaintext)
+        {
+            if (string.IsNullOrEmpty(plaintext))
+                return plaintext;
+
+            var bytes = Encoding.UTF8.GetBytes(plaintext);
+            var protectedBytes = MachineKey.Protect(bytes, Purposes);
+            return Convert.ToBase64String(protectedBytes);
+        }
+
+        public static string Unprotect(string protectedValue)
+        {
+            if (string.IsNullOrEmpty(protectedValue))
+                return protectedValue;
+
+            try
+            {
+                var protectedBytes = Convert.FromBase64String(protectedValue);
+                var bytes = MachineKey.Unprotect(protectedBytes, Purposes);
+                return bytes == null ? null : Encoding.UTF8.GetString(bytes);
+            }
+            catch
+            {
+                return null;
+            }
+        }
+
+        public static bool LooksProtected(string value)
+        {
+            if (string.IsNullOrWhiteSpace(value))
+                return false;
+
+            try
+            {
+                var bytes = Convert.FromBase64String(value);
+                return bytes.Length > 16;
+            }
+            catch
+            {
+                return false;
+            }
+        }
+    }
+}