- Add CLI entry in backend with default REPL, persistent history, aliases - Add commands: users:list/create/verify, events:list/details/participants/checkin, matches:list, logs:app, logs:messages - Support running subcommands inside REPL via .cli and run() - Add Makefile targets: dev-cli, prod-cli, dev/prod up/down (+rebuild) - Update README and add docs/ADMIN_CLI.md - Add CLI tests with mocked Prisma