docker-mailserver LXC für Proxmox: Stack + Admin-UI + Webmail + Hardening

- dms-lxc.sh: Proxmox-Host-Installer (unprivilegierter LXC, Debian 13, Docker),
  curl-Self-Download, Multi-Domain-DKIM, SnappyMail-Provisionierung, PVE-Firewall
- Stack: docker-mailserver, Node-Admin-API (Supabase-Auth), React-Admin-UI
  (OPENBUREAU-Look), SnappyMail (Shibui-Theme), Rspamd-Web-UI, docker-socket-proxy
- Admin: Postfächer/Aliase/Catch-all/Quota, editierbare Domains+Settings,
  Server (Quota/Queue über abgesicherte Bridge), Status & DNS
- Hardening: no-new-privileges, Whitelisted exec-Bridge, Rspamd-Passwort,
  .env chmod 600, PVE-CT-Firewall, generisch/teilbar (keine festen Domains)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

stack/api/package.json

@@ -0,0 +1,20 @@
+{
+  "name": "dms-admin-api",
+  "version": "1.0.0",
+  "private": true,
+  "type": "module",
+  "description": "Admin API für docker-mailserver — verwaltet Konten/Aliase/Quotas über die DMS-Config-Dateien (Supabase-Auth).",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js"
+  },
+  "dependencies": {
+    "@supabase/supabase-js": "^2.45.0",
+    "dockerode": "^4.0.2",
+    "express": "^4.19.2",
+    "sha512crypt-node": "^1.0.0"
+  },
+  "engines": {
+    "node": ">=20"
+  }
+}