Merge pull request #453 from besscroft/fix/admin-empty-states

fix(admin): add empty states for image and album management

Merge pull request #452 from besscroft/fix/signup-success-i18n

fix: correct auth success i18n toast messages

Merge pull request #450 from besscroft/chore/update-deps-all

chore(deps): update deps

Merge pull request #448 from besscroft/feat/admin-default-theme-setting

feat: add default theme configuration option

Merge pull request #447 from besscroft/feat/gallery-loading-blurhash-skeleton

feat(gallery): improve image loading experience and support original image display configuration

Merge pull request #445 from besscroft/feat/admin-backup-import-export

fix(i18n): update localized translations for "backup"

feat: add admin backup import/export with versioned backup package

Merge pull request #444 from besscroft/feat/admin-fixed-shell

feat(admin): add admin toolbar component and optimize layout structure