backend: separate App and server, add websocket endpoint, accept data directory command argument. initialize sqlalchemy database and models in new module. frontend: create backend class for managing ws connection, move ui to chat_screen, create scaffold chat and agent classes.

testing/signup.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+URL="http://localhost:5000/user/signup"
+DATA='{"username":"test-user","email":"user@test.com","password":"123456"}'
+
+RESPONSE=$(curl -s -X POST $URL -H "Content-Type: application/json" -d "$DATA")
+echo $RESPONSE