feat: add environment variable support for admin user creation in backend

backend/scripts/send_digest.py

@@ -18,6 +18,9 @@ import json
 import urllib.request
 import urllib.error
 
+# NOTE: When targeting a proxied frontend URL (e.g. nginx), append /api to the URL.
+# e.g. API_BASE_URL=https://dev.chores.ryankegel.com/api
+# Without /api, nginx will not forward requests to the backend and will return 405.
 API_BASE_URL = os.environ.get('API_BASE_URL', 'http://localhost:5000').rstrip('/')