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/auth_urls.py

@@ -1,15 +1,12 @@
 from django.urls import path
+from rest_framework_simplejwt.views import TokenObtainPairView, TokenRefreshView
 
-urlpatterns = []
+from .auth_views import ChangePasswordView, MeView, RegisterView
 
-try:
-    from django.conf import settings
-    if getattr(settings, 'USE_JWT_AUTH', False):
-        from rest_framework_simplejwt.views import TokenObtainPairView, TokenRefreshView
-
-        urlpatterns = [
-            path('auth/token/', TokenObtainPairView.as_view(), name='token_obtain_pair'),
-            path('auth/token/refresh/', TokenRefreshView.as_view(), name='token_refresh'),
-        ]
-except ImportError:
-    pass
+urlpatterns = [
+    path('auth/register/', RegisterView.as_view(), name='auth_register'),
+    path('auth/me/', MeView.as_view(), name='auth_me'),
+    path('auth/me/password/', ChangePasswordView.as_view(), name='auth_change_password'),
+    path('auth/token/', TokenObtainPairView.as_view(), name='token_obtain_pair'),
+    path('auth/token/refresh/', TokenRefreshView.as_view(), name='token_refresh'),
+]