feat: add user authentication with separate login and register pages

- Custom User model with email as unique identifier (AUTH_USER_MODEL)

- POST /api/auth/register/ with email validation, password min 8 chars, duplicate rejection

- POST /api/auth/login/ returning JWT (access + refresh) tokens

- Passwords hashed via Django's make_password

- React LoginPage and RegisterPage with form validation

- AuthContext with useReducer for auth state management

- Axios API client with JWT token injection

- TypeScript conversion of frontend scaffold

api/accounts/urls.py

@@ -0,0 +1,10 @@
+from django.urls import path
+
+from accounts import views
+
+app_name = "accounts"
+
+urlpatterns = [
+    path("register/", views.register_view, name="register"),
+    path("login/", views.login_view, name="login"),
+]