Add daily 2 AM cron schedule for node failover simulation workflow. Relax AITBC address validation to support variable-length addresses. Add missing logging import to chain_sync. Make coordinator database initialization non-fatal to allow startup even if init_db fails. Replace Ethereum address validation with AITBC-specific format checks in multisig transactions. Standardize PYTHONPATH across all systemd services to include
The wrapper scripts were setting PYTHONPATH to only the app's src directory,
causing ModuleNotFoundError when trying to import from the aitbc package.
Added REPO_DIR to PYTHONPATH to ensure aitbc module can be imported.
