refactor(photos): remove NestJS backend, use local-first + direct mana-media

The Photos NestJS backend was a proxy to mana-media that enriched
responses with local album/favorite/tag data. Now:

- Albums store → local-first via albumCollection + albumItemCollection
- Favorites → local-first via favoriteCollection (toggle in IndexedDB)
- Photo tags → local-first via photoTagCollection
- Photo listing/stats → direct mana-media API calls from frontend
- Upload → direct mana-media upload from frontend
- Delete → direct mana-media delete from frontend

Removed 27 TypeScript files, 1 Docker container, 1 port (3039).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/setup-databases.sh

@@ -140,7 +140,7 @@ setup_service() {
             ;;
         photos)
             create_db_if_not_exists "photos"
-            push_schema "@photos/backend" "photos"
+            # Schema managed by mana-sync (backend removed)
             ;;
         finance)
             create_db_if_not_exists "finance"