SpecialX a75527be80 feat(content): eager invalidation and optimistic lock for cqrs ...

M4: ADR-038 Eager Invalidation + ADR-039 Optimistic Lock

- EagerInvalidationService: Redis DEL after MySQL commit

- Cache key conventions for textbook/chapter/kp/question

- Version header check (If-Match/X-Expected-Version) on write endpoints

- 409 Conflict on version mismatch

- All write endpoints return updatedAt timestamp

2026-07-15 01:28:20 +08:00

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