- Introduce AppState { pool, jwt_secret } so JWT_SECRET is loaded once in
main() and any missing value is a fatal startup error rather than a 500
on the first request. All four env::var("JWT_SECRET") call sites in
auth.rs and middleware.rs are replaced with state.jwt_secret.
- build_test_router embeds the fixed test secret so integration tests do
not need to set JWT_SECRET in the environment.
- Add tracing::warn! in login (invalid password) and register (username
taken) to surface brute-force attempts in production logs.
- Fix daily-challenge race condition: after INSERT OR IGNORE, re-SELECT
the persisted row so concurrent requests both return the winner's data.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
funman300
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