- Add infrastructure.md and workflow files to .gitignore to prevent sensitive info leaks
- Change blockchain node mempool backend default from memory to database for persistence
- Refactor blockchain node logger with StructuredLogFormatter and AuditLogger (consistent with coordinator)
- Add structured logging fields: service, module, function, line number
- Unify coordinator config with Database
- Add root-level *.json to .gitignore to prevent wallet backup leaks
- Replace wildcard CORS origins with explicit localhost URLs across all apps
- Add OPTIONS method to CORS allowed methods for preflight requests
- Update coordinator database to use absolute path in data/ directory to prevent duplicates
- Add JWT secret validation in coordinator config (must be set via environment)
- Replace deprecated get_session dependency with Session