FROSADO / onecloudriver / 31972252471

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feat(fs): serialize content snapshots against concurrent writes (#93)

* feat(fs): serialize content snapshots against concurrent writes

Add a per-inode lock to ContentCache and acquire it in WriteAt, Insert,
InsertStream, ReadAll, and SumQuickXorHash. QueueUpload reads content via
ReadAll (Seek + io.ReadAll on the shared FD), which could race with a
concurrent FUSE Write (WriteAt) and capture a torn file. The per-inode
lock makes every snapshot a consistent point-in-time copy.

Closes #64

* fix(fs): use comma-ok type assertion in lockFor to satisfy errcheck

The security lint (errcheck with check-type-assertions) flags the
single-value type assertion. Use the comma-ok form, matching the existing
ContentCache style.

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