Add JWT auth with per-user data isolation and account settings.

Users can register, log in, and manage profile/password in a personal account page; server data is scoped by owner across contacts, maps, tags, and import.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/core/urls.py

@@ -3,7 +3,7 @@ from django.urls import path
 from . import views
 
 urlpatterns = [
-    path('meta/choices/', views.meta_choices, name='meta-choices'),
-    path('relation-types/', views.relation_types, name='relation-types'),
-    path('network-map-choices/', views.network_map_choices, name='network-map-choices'),
+    path('meta/choices/', views.MetaChoicesView.as_view(), name='meta-choices'),
+    path('relation-types/', views.RelationTypesView.as_view(), name='relation-types'),
+    path('network-map-choices/', views.NetworkMapChoicesView.as_view(), name='network-map-choices'),
 ]