How to create a single admin user without registration and all the other stuff typically seen in an authentication workflow?
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If there is only one admin, you could just have basic authentication over ssl.
Or store a hash of a salted password in your backend code and create a simple just-password-login form that stores something in the session that expires in, say 30 minutes. You can even create a small "binary" that stores a given password as a salted hash in a separate file and include/require that in the config.