FROSADO / onecloudriver / 31978619249

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feat(fs): dirty inode tracking -> SerializeDirty (cut BoltDB writes >=99%) (#97)

* feat(fs): dirty inode tracking -> SerializeDirty (cut BoltDB writes >=99%)

SerializeAll rewrote the whole browsed tree to BoltDB on every delta poll
(5 min) and on unmount, in a single giant transaction. Replace the delta
poll path with SerializeDirty: mutations mark inodes dirty (plus a
tombstone set for deletions), and SerializeDirty persists only those, in
batches of 500 inodes per transaction. The dirty sets are swapped out
atomically so concurrent mutations can never be lost by a
delete-after-commit race. Final SerializeAll on unmount stays as the
durability guarantee.

Benchmark (1000-inode tree, 1 mutation): 240000 -> 240 bytes written per
delta sync (-99.9%). New crash-sim mode validates SerializeDirty batch
commits under SIGKILL.

* feat(fs): log SerializeDirty persist counts at debug level

Gives the delta loop visibility into how many inodes each SerializeDirty
persists (and confirms idle cycles write nothing).

122 of 162 new or added lines in 3 files covered. (75.31%)

4352 of 5580 relevant lines covered (77.99%)

2701.34 hits per line