Stage 7: command-line helpers dsv, duser, dfw, dsys (0.5.0)

- das-helpers replaces the dsv package and adds shared functions in
  /usr/lib/das/helpers.sh (bilingual messages, sudo re-exec, prompts).
- dsv new creates a runit service (command, user, directory, environment,
  svlogd log) and checks it stays up; dsv rm deletes one not from a package.
- duser: list, add (installer groups, --admin, key, password), del, passwd,
  lock/unlock (key logins too), key add|list|rm, groups +/-.
- dfw: allow/deny/status/reload for the tcp_ports and udp_ports sets of the
  inet das table, kept in /etc/nftables.d/dfw.nft and checked with nft -c.
- dsys: info, hostname, timezone, locale, keymap.
- xtools-minimal on both images.
- nftables.conf no longer suggests restarting the nftables service: its
  finish script flushes the whole ruleset, fail2ban's and Docker's included.
- das-server-install 0.2.0 mentions the helpers when it finishes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

srcpkgs/das-server-installer/template

@@ -1,6 +1,6 @@
 # Template file for 'das-server-installer'
 pkgname=das-server-installer
-version=0.1.0
+version=0.2.0
 revision=1
 depends="bash dialog das-install-common btrfs-progs dosfstools gptfdisk parted
  rsync util-linux grub grub-x86_64-efi efibootmgr"