Fix #3902: Make first user created via reverse proxy an admin #3920
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Issue
Fixes #3902 - When Navidrome is accessed for the first time through a reverse proxy with authentication headers (Remote-User), it creates a regular non-admin user. This prevents the normal "first user is admin" flow, leaving the system without an admin user.
Changes
handleLoginFromHeaders
function inserver/auth.go
to check if there are any existing users before creating a new userTesting
Added new test cases to verify:
This change maintains consistent behavior with manual user creation where the first user is always an admin.