models.py moved to models/models.py

refactor all imports

server/routes/clients.py

@@ -1,7 +1,7 @@
 import sys
 sys.path.append('/workspace')
 from flask import Blueprint, request, jsonify
-from models import Client, ClientGroup
+from models.models import Client, ClientGroup
 from database import Session
 
 clients_bp = Blueprint("clients", __name__, url_prefix="/api/clients")