chore: initial skeleton

- docs/architecture.md: native rewrite plan (5 services + control plane,
  Active-Active cluster like nmg, Floating-IP for HTTP ingress)
- cmd/edgeguard-{api,scheduler,ctl}: minimal Gin + CLI stubs
- packaging/debian/edgeguard-{api,ui,meta}: control + maintainer scripts
- deploy/systemd/edgeguard-api.service + edgeguard-scheduler.service
  with hardening defaults
- Makefile: build / cross-compile (amd64+arm64) / deb / publish targets
- scripts/install.sh + scripts/apt-repo/build-package.sh stubs

scripts/install.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+# ============================================================================
+# EdgeGuard — Bootstrap Installer (One-Liner)
+# ============================================================================
+# Usage:
+#   curl -fsSL https://get.edgeguard.netcell-it.de | sudo bash
+#   curl -fsSL https://get.edgeguard.netcell-it.de | sudo bash -s -- \
+#       --join https://<existing-node-fqdn> --token <cluster-join-token>
+#
+# Platform: Debian 13 (Trixie) or Ubuntu 24.04 LTS (Noble), amd64 + arm64.
+# Idempotent — safe to re-run.
+# ============================================================================
+set -euo pipefail
+
+# ─── TODO — Stub. Wird in Task #4 implementiert. ────────────────────────────
+echo "EdgeGuard installer stub — full install.sh follows in Task #4."
+exit 0