feat: contact form backend for linux and freebsd servers

Assisted-by: GLM 5.3 Flash

internal/version/version_test.go

@@ -0,0 +1,22 @@
+// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
+// SPDX-License-Identifier: MIT
+
+//go:build linux || freebsd
+
+package version
+
+import "testing"
+
+func TestName(t *testing.T) {
+	if Name != "nuntius" {
+		t.Errorf("Name = %q, want %q", Name, "nuntius")
+	}
+}
+
+func TestVersion(t *testing.T) {
+	// The recorded version is never empty: at a tag it is the tag, elsewhere
+	// a pseudo-version, and (devel) outside version control.
+	if Version() == "" {
+		t.Error("Version must not be empty")
+	}
+}