refactor(plugins): restructure admin and message_gateway into standard layered sub-packages

backend/plugins/drivers/driver_http/frontend_embedded.go

@@ -0,0 +1,24 @@
+//go:build embed_frontend
+
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package driver_http
+
+import (
+	"embed"
+	"io/fs"
+)
+
+//go:embed all:dist
+var frontendFS embed.FS
+
+// frontendAssets returns the exported Next.js bundle shipped inside this binary.
+func frontendAssets() fs.FS {
+	sub, err := fs.Sub(frontendFS, "dist")
+	if err != nil {
+		panic("driver_http: embedded frontend bundle unavailable: " + err.Error())
+	}
+
+	return sub
+}