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

packaging/debian/edgeguard-meta/DEBIAN/control

@@ -0,0 +1,14 @@
+Package: edgeguard
+Version: __VERSION__
+Architecture: all
+Maintainer: NetCell IT <support@netcell-it.de>
+Homepage: https://edgeguard.netcell-it.de
+Description: EdgeGuard — meta package
+ Pulls the full EdgeGuard stack: management API, UI, configured
+ third-party services (HAProxy, Angie, Squid, WireGuard, nftables).
+ .
+ Install this package to get a complete EdgeGuard node.
+Depends: edgeguard-api (= ${binary:Version}), edgeguard-ui (= ${binary:Version})
+Section: admin
+Priority: optional
+Installed-Size: 0