v5.1.0

refactor: simplify register handler, use unified handler for all douban items, use safe_insert' and 'safe_update', and truncate long description in those functions. refactor mapping for douban and neodb. use sync_genres` for both douban and neodb. remove hard-coded dark mode css, and use batch query for get collections. add helper functions for preview_source_data, and use prepare for db queries.
refactor: use php render collections instead of js
refactor: compatible to php 8.0

Full Changelog: v5.0.9...v5.1.0