feat: Immich album linking with auto-sync (#206)

- Link Immich albums to trips — photos sync automatically
- Album picker shows all user's Immich albums
- Linked albums displayed as chips with sync/unlink buttons
- Auto-sync on link: fetches all album photos and adds to trip
- Manual re-sync button for each linked album
- DB migration: trip_album_links table

fix: shared Immich photos visible to other trip members

- Thumbnail/original proxy now uses photo owner's Immich credentials
  when userId query param is provided, fixing 404 for shared photos
- i18n: album keys for all 12 languages

client/src/i18n/translations/zh.ts

@@ -1346,6 +1346,12 @@ const zh: Record<string, string> = {
   'memories.newest': '最新优先',
   'memories.allLocations': '所有地点',
   'memories.addPhotos': '添加照片',
+  'memories.linkAlbum': '关联相册',
+  'memories.selectAlbum': '选择 Immich 相册',
+  'memories.noAlbums': '未找到相册',
+  'memories.syncAlbum': '同步相册',
+  'memories.unlinkAlbum': '取消关联',
+  'memories.photos': '张照片',
   'memories.selectPhotos': '从 Immich 选择照片',
   'memories.selectHint': '点击照片以选择。',
   'memories.selected': '已选择',