fix: harden vlog truncate state and sstable stat handling

refactor: centralize SyncDir in vfs and sync docs

feat: load options from toml

Release v0.4.2

Security & Bug Fixes:
- fix(cache): Fix uninitialized threshold causing Count-Min Sketch/Bloom Filter reset failure (W-TinyLFU).
- fix(cache): Add bounds check for key hash in Set() to prevent uint32 overflow and ensure consistency.
- fix(util): [CodeQL] Prevent integer overflow in SSTable FID parsing.

Infrastructure:
- chore: Add CodeRabbit AI review configuration.
- deps: Bump ants/v2 to v2.11.4.

Refactor vlog pipeline and update docs

Release v0.4.0

Release v0.3.0

version: update version