- Change chmod permissions from 0600 (owner-only) to 0666 (read/write for all) for database file and WAL files in blockchain node database initialization
- Update comment to reflect permissive permissions for handling filesystem restrictions
- Update agent daemon service database path from /var/lib/aitbc/data/ait-mainnet/chain.db to /var/lib/aitbc/data/chain.db
- Remove ProtectSystem=strict and ReadWritePaths from agent-daemon, gpu, learning, marketplace, modality-optimization, monitor, multimodal, and openclaw services
- Add ProtectSystem=no to coordinator-api, exchange-api, and explorer services to allow database writes for SQLite WAL mode
- Retain NoNewPrivileges and ProtectHome security settings across all services