remove bot-tonconnect, fix auth last_use

app/api/routes/auth.py

@@ -99,6 +99,9 @@ async def s_api_v1_auth_twa(request):
         )
     ))).scalars().first()
 
+    known_user.last_use = datetime.now()
+    request.ctx.db_session.commit()
+
     return response.json({
         'user': known_user.json_format(),
         'connected_wallet': ton_connection.json_format() if ton_connection else None,