Add Memory Mode as separate feature with independent schedule

Replace the previous memory order_by option with a dedicated Memory Mode
feature that has its own enable toggle, schedule (interval/start hour),
and settings. Users can now run both Scheduled Assets and Memory Mode
independently at different times.

Memory Mode fetches photos taken on today's date in previous years using
the memory_date parameter, sorted by date ascending (oldest first).

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

manifest.json

@@ -1,3 +1,3 @@
 {
-  "version": "1.24.0"
+  "version": "1.25.0"
 }