Bug: SEED_ADMIN_EMAIL creates a password-less user at app startup, which made
/auth/bootstrap return 403 '1 users already exist' on a fresh deployment —
leaving the operator no way to log in (the seed user has no password, and
/auth/token requires one).
Fix: bootstrap is now disabled only when at least one user has a
password_hash set. On a fresh deploy with a seed user:
- POST /auth/bootstrap { email: <matches seed>, password: X } → sets the
password on the seed user, promotes to admin, returns token.
- With a non-matching email, a new admin is created alongside the seed user.
Lock semantics: bootstrap self-deactivates as soon as any password is set.
Tests: 8 passing, including new test_bootstrap_activates_seed_user and
test_bootstrap_disabled_when_password_user_exists covering the two halves.
2b17973796