feat(node): configure system environment through the desktop workflow

apps/node-agent/packaging/postinst

@@ -5,28 +5,10 @@ case "$1" in
     if ! getent passwd mission-core-node >/dev/null; then
       adduser --system --group --home /var/lib/mission-core-node --no-create-home --disabled-login mission-core-node
     fi
-    mc_node_ssh_snippet=/etc/ssh/sshd_config.d/60-mission-core-node.conf
-    mc_node_ssh_template=/usr/share/mission-core-node/60-mission-core-node.conf
-    if [ -L "$mc_node_ssh_snippet" ] || { [ -e "$mc_node_ssh_snippet" ] && ! cmp -s "$mc_node_ssh_template" "$mc_node_ssh_snippet"; }; then
-      echo "Mission Core Node: existing custom SSH snippet preserved; configuration conflict." >&2
-      exit 1
-    fi
-    install -D -m 0644 "$mc_node_ssh_template" "$mc_node_ssh_snippet"
+    # Only bootstrap required to open the GUI. Operational configuration is a
+    # versioned job started by «Настройка окружения → Сконфигурировать».
     if [ -d /run/systemd/system ]; then
-      install -d -m 0755 /run/sshd
-      /usr/sbin/sshd -t
-      mc_node_ssh_config=$(/usr/sbin/sshd -T)
-      if ! printf '%s\n' "$mc_node_ssh_config" | grep -Fx 'authorizedkeyscommand /usr/lib/mission-core-node/node-agent ssh-keys %u' >/dev/null; then
-        echo "Mission Core Node: another AuthorizedKeysCommand overrides Node SSH access. Existing configuration was preserved; resolve this conflict before accepting setup." >&2
-        exit 1
-      fi
-      if ! printf '%s\n' "$mc_node_ssh_config" | grep -Fx 'authorizedkeyscommanduser mission-core-node' >/dev/null; then
-        echo "Mission Core Node: conflicting AuthorizedKeysCommandUser; existing configuration was preserved." >&2
-        exit 1
-      fi
       systemctl daemon-reload
-      systemctl enable --now ssh.service
-      systemctl try-reload-or-restart ssh.service
       systemctl enable mission-core-node.service
       systemctl restart mission-core-node.service
     fi