fix: prevent E2EE metadata rollback#9426
fix: prevent E2EE metadata rollback#9426Yaroslav98214 wants to merge 1 commit intonextcloud:masterfrom
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Persist counters and key checksums so clients can reject downgraded metadata. Signed-off-by: Yaroslav98214 <diakovichyaroslav30@gmail.com>
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Summary: Validate E2EE metadata counter and keyChecksums; persist values in journal; add regression tests.
Tests: Not run (requires KF6Archive + Qt 6.8+).