chore: add build-system config and update version to 0.2.0

uv.lock

@@ -3499,8 +3499,8 @@ wheels = [
 
 [[package]]
 name = "tradingagents"
-version = "0.1.0"
-source = { virtual = "." }
+version = "0.2.0"
+source = { editable = "." }
 dependencies = [
     { name = "backtrader" },
     { name = "chainlit" },