I'm having a hard time understanding what you're looking for. Browser bookmarks seem to fulfill the technical requirements, but you seem to want something different. Maybe a sort of unified feed?
Easily searchable and navigable too.
May be I need a way to import favorites from all these services to my own collection. And then ... categorize them with AI perhaps?
Then there is https://pi.dev/packages/pi-obsidian which I use to give an agent access to my vault for searching/organising tasks