add ramdisk, load AI model to ramdisk and start recognition from it

rewrite zmq to DEALER and ROUTER
add GET_USER command to get CurrentUser from Python
all auth is on the python side
inference run and validate annotations on python

Azaion.CommonSecurity/Services/PythonResourceLoader.cs

@@ -0,0 +1,60 @@
+using System.Text;
+using Azaion.CommonSecurity.DTO;
+using Azaion.CommonSecurity.DTO.Commands;
+using MessagePack;
+using NetMQ;
+using NetMQ.Sockets;
+
+namespace Azaion.CommonSecurity.Services;
+
+public interface IResourceLoader
+{
+    Task<MemoryStream> LoadFile(string fileName, CancellationToken ct = default);
+}
+
+public interface IAuthProvider
+{
+    User CurrentUser { get; }
+}
+
+
+public class PythonResourceLoader : IResourceLoader, IAuthProvider
+{
+    private readonly DealerSocket _dealer = new();
+    private readonly Guid _clientId = Guid.NewGuid();
+
+    public User CurrentUser { get; }
+
+    public PythonResourceLoader(ApiCredentials credentials)
+    {
+        //Run python by credentials
+        _dealer.Options.Identity = Encoding.UTF8.GetBytes(_clientId.ToString("N"));
+        _dealer.Connect($"tcp://{SecurityConstants.ZMQ_HOST}:{SecurityConstants.ZMQ_PORT}");
+
+        _dealer.SendFrame(MessagePackSerializer.Serialize(new RemoteCommand(CommandType.GetUser)));
+        var user = _dealer.Get<User>(out _);
+        if (user == null)
+            throw new Exception("Can't get user from Auth provider");
+
+        CurrentUser = user;
+    }
+
+
+    public async Task<MemoryStream> LoadFile(string fileName, CancellationToken ct = default)
+    {
+        try
+        {
+            _dealer.SendFrame(MessagePackSerializer.Serialize(new RemoteCommand(CommandType.Load, fileName)));
+
+            if (!_dealer.TryReceiveFrameBytes(TimeSpan.FromMilliseconds(1000), out var bytes))
+                throw new Exception($"Unable to receive {fileName}");
+
+            return await Task.FromResult(new MemoryStream(bytes));
+        }
+        catch (Exception ex)
+        {
+            throw new Exception($"Failed to load fil0e '{fileName}': {ex.Message}", ex);
+        }
+    }
+
+}