[V1.0] Working application, added notifications.

Ready to upload to store.

backend/requirements.txt

@@ -47,8 +47,12 @@ click-plugins==1.1.1
     # via celery
 click-repl==0.3.0
     # via celery
+dnspython==2.7.0
+    # via eventlet
 ecdsa==0.19.1
     # via python-jose
+eventlet==0.39.1
+    # via -r requirements.in
 fastapi==0.115.12
     # via -r requirements.in
 gevent==25.4.1
@@ -61,6 +65,7 @@ google-genai==1.11.0
     # via -r requirements.in
 greenlet==3.2.0
     # via
+    #   eventlet
     #   gevent
     #   sqlalchemy
 h11==0.14.0