Jakub Zych 487d573208 feat: enforce attempt limits, time limits and one-way tests ...

- Service.Start resumes an open test attempt, closes expired ones at
  their deadline and refuses a start past max_attempts under an
  advisory lock; StartAttempt stays as a wrapper
- answers to a test are accepted until the deadline plus
  golem15.quizzes.test.grace_seconds; one_way answers are final
- a test covers the whole quiz and keeps a stable per-attempt order
- 409 bodies carry a code; list and attempt rows carry attempts_left,
  question_types and seconds_left; import accepts the test keys

2026-11-09 14:07:37 +01:00

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