chore: add project scaffolding and build tooling

Go module, makefile (build, test, docker, e2e targets), version embedding, initialize script, vars template, ignores and the project plan.

version.go

@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+// Copyright (C) 2026 Bryan Joshua Pedini
+
+package main
+
+// Build metadata, overridden at link time through -ldflags -X
+var APP_VERSION string = "latest"
+var COMMIT_ID string = "undefined"