Fill the remaining coverage gaps in src/routes/admin-users.ts and add the
domain lifecycle test, bringing the file to 100% stmts/branch/funcs/lines.
New tests (apps/api/test/admin-users.test.ts):
- password route: 404 unknown id; 400 when better-auth setUserPassword throws
(driven via a spy so the catch path is deterministic).
- toListItem: a null DB role lists as 'worker' (nullish-coalescing fallback).
- role route: 400 on an invalid role body; 404 on an unknown id.
- reactivate route: 404 on an unknown id.
Lifecycle (apps/api/test/integration/user-lifecycle.test.ts): admin creates a
worker -> worker signs in and the bearer authorizes /api/me -> admin deactivates
(session rows deleted, so the pre-issued token 401s and fresh sign-in is blocked)
-> admin reactivates -> sign-in works again.
The two last-admin guards (role + deactivate routes) are unreachable over HTTP
(the self-demote / self-deactivate guards above already handle caller===target,
so any caller reaching them is a distinct active admin and
activeAdminsExcluding(target) >= 1). Annotated with /* c8 ignore */ + reasons
rather than left as silent gaps; the guard logic is unit-tested via
activeAdminsExcluding.
No production behavior changed; no bugs found.
