feat: replace email flows with in-app notifications

Add recipient notification detail and filtering, a queued admin composer, and contextual automatic titles. Retire email delivery, obsolete auth routes, newsletter data, and related templates and settings.

.env.test

@@ -24,15 +24,6 @@ REDIS_URL=redis://localhost:6379/0
 CELERY_BROKER_URL=redis://localhost:6379/0
 CELERY_RESULT_BACKEND=redis://localhost:6379/1
 
-# Email
-EMAIL_BACKEND=django.core.mail.backends.locmem.EmailBackend
-EMAIL_HOST=localhost
-EMAIL_PORT=587
-EMAIL_USE_TLS=False
-EMAIL_HOST_USER=
-EMAIL_HOST_PASSWORD=
-DEFAULT_FROM_EMAIL=noreply@example.com
-
 # JWT
 JWT_SECRET_KEY=test-jwt-key
 JWT_ALGORITHM=HS256
@@ -42,7 +33,6 @@ JWT_REFRESH_TOKEN_LIFETIME=86400
 # Frontend integration
 CORS_ALLOWED_ORIGINS=http://localhost:3000
 FRONTEND_ROOT=http://localhost:3000
-FRONTEND_PASSWORD_RESET_PAGE=http://localhost:3000/reset-password
 FRONTEND_CALLBACK_URL=http://localhost:3000/payments/result
 
 # ZarinPal