feat: implement email verification flow with account activation and secure cookie configuration

backend/users/utils.py

@@ -0,0 +1,22 @@
+from django.conf import settings
+from django.contrib.auth.tokens import default_token_generator
+from django.core.mail import send_mail
+from django.utils.encoding import force_bytes
+from django.utils.http import urlsafe_base64_encode
+
+
+def send_activation_email(user):
+    token = default_token_generator.make_token(user)
+    uid = urlsafe_base64_encode(force_bytes(user.pk))
+    activation_url = f"{settings.FRONTEND_URL}/activate/{uid}/{token}"
+    subject = "Activate Your Piku Account"
+    message = f"""Hi {user.full_name},
+
+        Welcome to Pi Ku.
+
+        Please click the link below to activate your account:
+        >> {activation_url}
+
+        If you did not create this account, please ignore this email."""
+    send_mail(subject, message, settings.FROM_EMAIL, [user.email], fail_silently=False)
+    return True