fix: use fallback dirname for node:18

packages/backend/src/cli.ts

@@ -1,18 +1,23 @@
 #!/usr/bin/env node
 
+import * as url from "node:url";
+
 const argv = [...process.argv];
 process.argv.splice(0, process.argv.length);
 
 import yargs from "yargs";
 import { hideBin } from "yargs/helpers";
 import * as path from "node:path";
 
+const dirname =
+  import.meta.dirname ?? url.fileURLToPath(new URL(".", import.meta.url));
+
 export async function cli(argv: string[]): Promise<void> {
   const start = await import("./commands/start.js").then((m) => m.default);
   const webDist =
     process.env.NODE_ENV === "development"
       ? undefined
-      : path.join(import.meta.dirname, "../frontend");
+      : path.join(dirname, "../frontend");
   yargs(hideBin(argv))
     .env("HAMH_")
     .scriptName("home-assistant-matter-hub")