Lukas 1c89454197 Add fail2ban dev test environment (Stage 0) ...

- Add bangui-sim filter (filter.d/bangui-sim.conf) matching the
  simulated authentication failure log format
- Add bangui-sim jail (jail.d/bangui-sim.conf) with maxretry=3,
  bantime=60s, findtime=120s, ignoreip safeguard, polling backend
- Mount Docker/logs/ into fail2ban container at /remotelogs/bangui
  in compose.debug.yml
- Add simulate_failed_logins.sh to write synthetic failure lines
- Add check_ban_status.sh with optional --unban flag
- Add dev-ban-test Makefile target for one-command smoke testing
- Write Docker/fail2ban-dev-config/README.md with setup and
  troubleshooting docs
- Update .gitignore to track custom config files while still
  excluding auto-generated linuxserver fail2ban files

2026-03-03 21:00:08 +01:00

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