feat(accumulator): compact tx non-frozen nodes

[jolestar]

Summary

• stop persisting transient non-frozen tx accumulator nodes while keeping them in cache for proofs/reopen behavior
• add rooch db tx-accumulator-compact to dry-run/delete historical non-frozen nodes, with batching/progress and optional RocksDB compaction
• add unit coverage for replaying historical non-frozen hashes and deleting only existing candidates

Tests

• cargo fmt --all -- --check
• cargo check -p rooch --bin rooch
• cargo test -p accumulator -- --nocapture
• cargo test -p rooch tx_accumulator_compact --lib -- --nocapture

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[Copilot]

Pull request overview

This PR reduces transaction accumulator storage growth by no longer persisting transient (non-frozen) internal nodes, relying on reconstruction from frozen subtree roots/placeholders when needed, and adds a CLI command to clean up historically persisted non-frozen nodes from RocksDB.

Changes:

• Stop writing non-frozen tx accumulator nodes to durable storage while keeping them available via cache/reconstruction for proofs and reopen behavior.
• Add rooch db tx-accumulator-compact to replay historical leaves, identify persisted non-frozen node hashes, and delete them in batches (optionally forcing RocksDB compaction).
• Wire the new command into the db CLI command set.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
moveos/moveos-commons/accumulator/src/tree.rs	Avoid persisting non-frozen nodes; add frontier hash reconstruction path during node-hash lookups.
crates/rooch/src/commands/db/mod.rs	Register the new TxAccumulatorCompact DB subcommand and dispatch it.
crates/rooch/src/commands/db/commands/mod.rs	Export the new tx_accumulator_compact command module.
crates/rooch/src/commands/db/commands/tx_accumulator_compact.rs	Implement the compact command, batching/progress output, optional CF compaction, and unit tests.