feat: add JWT auth foundation - /api/v1/ with admin login, refresh, me, health endpoints

- Add djangorestframework-simplejwt==5.3.1 to requirements-docker.txt
- Configure REST_FRAMEWORK with JWTAuthentication and SIMPLE_JWT settings
- Create admin_api Django app with AdminLoginView, MeView, HealthView
- Wire /api/v1/ routes without touching existing /api/ mobile endpoints
- Resolve pre-existing events migration conflict (0010_merge)
- Superuser admin created for initial authentication

eventify/urls.py

@@ -35,7 +35,10 @@ urlpatterns = [
     path('partner/', include('partner.urls')),
     path('banking/', include('banking_operations.urls')),
     path('api/', include('mobile_api.urls')),
+    path('api/v1/', include('admin_api.urls')),
     # path('web-api/', include('web_api.urls')),
+
+    path('summernote/', include('django_summernote.urls')),
 ]
 
 urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)