refactor: NAS mirror uses base folder directly (no redundant klarbild segment)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XNQ8ghPfzAfsyVYd6HgFb6

src/lib/nas.ts

@@ -77,7 +77,8 @@ export async function mirrorItemToNas(itemId: string): Promise<{ ok: boolean; me
   try {
     const buf = await getObject(it.result_path);
     const ym = new Date(it.created_at || Date.now()).toISOString().slice(0, 7); // JJJJ-MM
-    await uploadToNas(cfg, posixpath.join('klarbild', ym), it.filename || `${it.id}.png`, buf);
+    // Struktur: <Basisordner>/JJJJ-MM/<Datei> — der Basisordner ist frei wählbar.
+    await uploadToNas(cfg, ym, it.filename || `${it.id}.png`, buf);
     await query(`UPDATE items SET nas_status='mirrored' WHERE id=$1`, [itemId]);
     return { ok: true, message: 'Auf NAS gesichert.' };
   } catch (e: any) {