feat: Implement FSM Restore from Snapshot and tests #115
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Implements the Restore() method for the FSM, allowing nodes to recover from snapshots. Includes helper methods for metadata handling, version validation, atomic database swap, and index rebuilding.
Adds unit tests for various restore scenarios (successful, corrupted snapshot, version mismatch, atomic swap) and integration tests for the full snapshot-restore cycle.
Note: Build is currently failing due to suspected workspace/tooling issues where compiler does not see latest code changes.