feat(engine): add FinlyticEngine microservice with trade lifecycle, AI reasoning gate, composite scoring, and unit tests

FinlyticEngine/Services/Mqtt/IEngineRpcClient.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Threading.Tasks;
+
+namespace FinlyticEngine.Services.Mqtt;
+
+public interface IEngineRpcClient
+{
+    Task<TResponse?> SendRpcRequestAsync<TResponse, TRequest>(
+        string channel,
+        TRequest requestData,
+        TimeSpan? timeout = null)
+        where TResponse : class
+        where TRequest : class;
+
+    Task PublishAsync<T>(string topic, T data, bool retain = false);
+}