Large albums opened slowly and flickered; the default album cover was
also lost in the media-objects refactor.
Large-album loading:
- quantize signed object URLs within a window and send Cache-Control so
previews are reused instead of re-fetched
- publish photo.updated (not photo.created) when variants are ready, so
clients update in place without reordering the grid
- worker concurrency + newest-first variant priority; raise default batch
Album cover:
- first uploaded photo becomes the cover when none is set
- clear the cover when the cover photo is trashed or moved out
- "set as album cover" in the photo context menu and actions panel
OpenSpec changes: fix-large-album-load, fix-album-cover
- rename Go module, binary, systemd unit, PG_DATABASE default, frontend package and docs from shared-album to galo
- add theme-aware halo emblem and favicon (new ui-branding capability)
- add make build-release (versioned, stripped, static binary) and run the binary from the repo root
- app_settings table (PostgreSQL migration 000010, SQLite 000002)
- internal/settings repository (Get/Set/Ensure) wired into store.Repos
- secret generated with crypto/rand on first start and persisted; reused on restart
- drop required JWT_SECRET from env/config; app.New takes a TokenManager and
storage.Open takes the resolved secret (URL_SECRET still overrides)
- docs updated
- introduce storage.Backend with S3 and local file-system implementations
- deliver all blobs via signed GET/HEAD /api/objects/<key> (Range, Content-Type)
- stream S3 objects through the backend; remove presigned URL path
- share shared HMAC Signer between backends
- remove S3_PUBLIC_URL; rename S3_PRESIGN_TTL to OBJECT_URL_TTL
- make storage label in health dynamic; nginx proxy_buffering off for objects
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