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

.gitignore

@@ -0,0 +1,44 @@
+# ── Go ────────────────────────────────────────────────────────────────────
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+*.test
+*.out
+go.work
+go.work.sum
+
+# ── Build artifacts ───────────────────────────────────────────────────────
+/build/
+/dist/
+/edgeguard-api
+/edgeguard-scheduler
+/edgeguard-ctl
+
+# ── Env / secrets ─────────────────────────────────────────────────────────
+.env
+.env.*
+!.env.example
+
+# ── Claude Code ───────────────────────────────────────────────────────────
+.claude/
+
+# ── Editor / OS ───────────────────────────────────────────────────────────
+.DS_Store
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# ── Debian packaging intermediates ────────────────────────────────────────
+*.deb
+*.buildinfo
+*.changes
+
+# ── mkdocs build output ───────────────────────────────────────────────────
+docs-site/site/
+
+# ── UI build output ───────────────────────────────────────────────────────
+management-ui/dist/
+management-ui/node_modules/