Add an explicit non-empty check before encrypting user-submitted
email/password fields in the create and update user routes, so a
request that bypasses the HTML `required` attribute gets a clean
400 instead of an unhandled ValueError from CredentialCipher.encrypt
propagating as a 500. Applies to all four credential fields on
create, and to the two email fields on update (the password-blank-
means-keep-existing behavior on update is unchanged).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Adds full CRUD for sync users (create/list/detail/edit) behind admin
auth and CSRF protection. Passwords are encrypted at rest and never
decrypted into a template context; only emails may be decrypted for
display on the edit form. Blank password fields on edit preserve the
existing encrypted password.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
