Fix Turbopack module resolution for lzma and restore path imports

src/lib/services/soundtracks.ts

@@ -14,14 +14,14 @@
  * `soundtrack_base_url` — see site-settings.ts defaults.
  */
 import { promises as fs } from "node:fs";
-import path from "node:path";
 import { parseBuffer } from "music-metadata";
+import { getRuntimePath } from "@/lib/utils/runtime-path";
 
 // ── Constants ──────────────────────────────────────────────────────
 
 /** On-disk directory where MP3s live. Fixed (not configurable from UI to
  *  avoid any path traversal risk). */
-export const SOUNDTRACK_DIR = path.join(
+export const SOUNDTRACK_DIR = getRuntimePath(
 	process.cwd(),
 	"public",
 	"swf",
@@ -48,7 +48,7 @@ export function getSoundtrackPath(code: string): string {
 	if (!isSafeSoundtrackCode(code)) {
 		throw new Error(`Unsafe soundtrack code: ${code}`);
 	}
-	return path.join(SOUNDTRACK_DIR, `${code}.mp3`);
+	return getRuntimePath(SOUNDTRACK_DIR, `${code}.mp3`);
 }
 
 /** Ensure the sounds directory exists (mkdir -p). */