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/template

@@ -0,0 +1,15 @@
+# Template file for 'dsv'
+pkgname=dsv
+version=0.1.0
+revision=1
+depends="bash runit sudo"
+short_desc="Das OS service manager: enable, start and read logs of runit services"
+maintainer="Das <anry.das@gmail.com>"
+license="MIT"
+homepage="https://git.das.org.ua/das/Das-OS"
+
+do_install() {
+	vbin ${FILESDIR}/dsv
+	vcompletion ${FILESDIR}/dsv.bash-completion bash
+	vlicense ${FILESDIR}/LICENSE
+}