feat(hobbs-organizer): v1.2.0 photo frame (/photo) with Google Photos shared albums

- /photo full-screen slideshow (crossfade, blurred backdrop or fill, shuffle, date)
- admin Photos tab: add shared-album links (check, sync now, status/stale warnings),
  slideshow options, browser-resized uploads
- 6-hourly album sync scraping the share page (Library API no longer exposes
  user albums), caches 1920px + 64px copies in /data/photos
- /api/health/photos -> 503 when an album has not synced for 48h
- history/restore covers photo settings; min admin password length 6

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E9NnVEico3WvFxLyjy1iW3

tv app/Hobbs-Family-Organizer-Self-Hosted-v1.0.0/app/api/health/photos/route.ts

@@ -0,0 +1,13 @@
+import { currentSlideshow, staleAlbums } from "../../../_lib/photos";
+
+export const dynamic = "force-dynamic";
+
+/** 503 when any enabled album has not synced successfully for 48 hours. Probed by Prometheus. */
+export async function GET() {
+  const stale = await staleAlbums();
+  const { photos } = await currentSlideshow();
+  return Response.json(
+    { status: stale.length ? "stale" : "ok", photos: photos.length, staleAlbums: stale.map(({ title, lastSuccessAt, lastError }) => ({ title, lastSuccessAt, lastError })) },
+    { status: stale.length ? 503 : 200, headers: { "Cache-Control": "no-store" } },
+  );
+}