AniSitePvt

fix: api connectivity issues

fix: user agent request handler

feat(api-integration): add Jikan and MAL-Sync fallback API endpoints, watchlist DB sync route, list/settings views, and cache engine

feat(watch-page): collapse episodes sidebar by default, add related anime tab, and remove unused sidebar components

feat(anime-details): unify tabs into single scrollable details view, make sidebar sticky, and make episode search/sort controls side-by-side