replace python django backend with nodejs backend

ai/main.py

@@ -0,0 +1,17 @@
+import os
+import sys
+
+
+def main(*args):
+    from server import Server
+
+    args = [a for a in args]
+    port = args.index('--port') if '--port' in args else -1
+    port = int(args[port + 1]) if port >= 0 and port + 1 < len(args) else None
+
+    Server().serve(port=port)
+
+
+if __name__ == '__main__':
+    print(os.getcwd())
+    main(*sys.argv)