- Add parser_config TEXT field to hotspot_source (JSON: parser/item_path/field_map/builtin_name)
- Pluggable extractors: json_path, css, regex, rss, builtin
- 11 builtin platform parsers with real API endpoints:
weibo_hot zhihu_hot baidu_hot toutiao_hot bilibili_hot douyin_hot
36kr_hot github_trending hackernews v2ex_hot rsshub
- Each source reads its own parser_config — different sources can use
different extraction rules even if same type
- Updated index.ui with builtin parser reference