Stage 6: server image with a console installer (0.4.0)

- server/ profile and build-iso.sh [desktop|server]; make iso-server,
  make qemu-server, run-qemu.sh --serial; login on tty and ttyS0
- das-server: SSH, chrony, NetworkManager/dhcpcd, Docker with Compose,
  nftables (closed except SSH, own table), fail2ban reading socklog,
  sshd without root passwords, Docker log rotation, tools
- das-server-install: dialog installer in Ukrainian and English, or
  unattended with --config; GPT + Btrfs subvolumes, GRUB for UEFI and BIOS,
  serial console, SSH key with optional keys-only logins
- das-install-common: mount-source and postinstall shared with Calamares
- dsv: runit service manager (list, enable, disable, start, stop,
  restart, status, logs) with bash completion, also on the desktop
- das-update split into a subpackage without GTK; the window and tray
  icon move to /usr/libexec/das/das-update-gui
- das-snapper-setup enables dbus, which snapper needs
- TODO: ISO size review with measured numbers and options

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

srcpkgs/dsv/files/dsv.bash-completion

@@ -0,0 +1,32 @@
+# bash completion for dsv
+# shellcheck shell=bash
+_dsv() {
+	local cur=${COMP_WORDS[COMP_CWORD]} cmd=${COMP_WORDS[1]:-}
+	if ((COMP_CWORD == 1)); then
+		mapfile -t COMPREPLY < <(compgen -W "list status enable disable start stop restart logs help" -- "$cur")
+		return
+	fi
+	case $cmd in
+	enable)
+		# services that are not enabled yet
+		local all=() s
+		for s in /etc/sv/*/; do
+			s=${s%/}
+			s=${s##*/}
+			[[ -e /etc/runit/runsvdir/default/$s ]] || all+=("$s")
+		done
+		mapfile -t COMPREPLY < <(compgen -W "${all[*]}" -- "$cur")
+		;;
+	disable | start | stop | restart)
+		mapfile -t COMPREPLY < <(compgen -W "$(ls /etc/runit/runsvdir/default 2>/dev/null)" -- "$cur")
+		;;
+	status | logs | log)
+		if [[ $cmd == logs* ]] && ((COMP_CWORD == 3)); then
+			mapfile -t COMPREPLY < <(compgen -W "-f" -- "$cur")
+		else
+			mapfile -t COMPREPLY < <(compgen -W "$(ls /etc/sv 2>/dev/null)" -- "$cur")
+		fi
+		;;
+	esac
+}
+complete -F _dsv dsv