feat: add server, workstation, and cloud edition manifests

Define the three flagship editions as plain-text manifests:

- server (bastion): production server - observability stack, containers.
- workstation (forge): curated KDE Plasma + dev toolchains.
- cloud (nimbus): cloud kernel, cloud-init, guest agents.

Each manifest carries metadata (services to enable/mask), a package
list, a hardened kernel cmdline, and a btrfs fstab template.

editions/server/packages.list

@@ -0,0 +1,74 @@
+# Arcline Server — package set
+# Debian bookworm packages. Lines beginning with # are notes/optional.
+# The configure hook installs the Arcline toolchain and observability
+# components that are not in Debian main (grafana, loki).
+
+# ── base system ─────────────────────────────────────────────────────────────
+systemd
+systemd-sysv
+dbus
+libpam-systemd
+ca-certificates
+locales
+tzdata
+
+# ── boot ────────────────────────────────────────────────────────────────────
+grub-pc
+grub-efi-amd64
+shim-signed
+os-prober
+
+# ── kernel / firmware ───────────────────────────────────────────────────────
+linux-image-amd64
+firmware-linux-free
+
+# ── filesystem ──────────────────────────────────────────────────────────────
+btrfs-progs
+snapper
+zstd
+xz-utils
+
+# ── security / hardening ────────────────────────────────────────────────────
+openssh-server
+nftables
+apparmor
+apparmor-utils
+fail2ban
+unattended-upgrades
+libpam-pwquality
+
+# ── containers ──────────────────────────────────────────────────────────────
+docker.io
+podman
+runc
+containernetworking-plugins
+fuse-overlayfs
+slirp4netns
+
+# ── observability (Debian-main components) ─────────────────────────────────
+prometheus
+prometheus-node-exporter
+prometheus-alertmanager
+# grafana + loki are fetched from upstream repos by configure-system.sh
+
+# ── admin tooling ───────────────────────────────────────────────────────────
+curl
+wget
+jq
+git
+make
+rsync
+htop
+tmux
+vim-tiny
+unzip
+file
+ethtool
+sysstat
+chrony
+needrestart
+
+# ── Arcline toolchain (built from toolchain/) ───────────────────────────────
+# arcline-uptime arcline-check arcline-audit arcline-dns
+# arcline-vault arcline-email arcline-migrate arcline-billing
+# arcline-portal arcline-website arcline-status