Add agent balance fetch from proxy

src/Managing.Infrastructure.Web3/Models/Proxy/Web3ProxyError.cs

@@ -1,4 +1,5 @@
 using System.Text.Json.Serialization;
+using Managing.Domain.Accounts;
 
 namespace Managing.Infrastructure.Evm.Models.Proxy
 {
@@ -138,4 +139,16 @@ namespace Managing.Infrastructure.Evm.Models.Proxy
         [JsonPropertyName("hash")]
         public string Hash { get; set; }
     }
+
+    /// <summary>
+    /// Response for wallet balance operations
+    /// </summary>
+    public class Web3ProxyBalanceResponse : Web3ProxyResponse
+    {
+        /// <summary>
+        /// List of wallet balances if successful
+        /// </summary>
+        [JsonPropertyName("balances")]
+        public List<Balance> Balances { get; set; }
+    }
 }