You’re definitely looking for DEVONThink[1] if you haven’t seen it yet. Based on the description it gathers all your research for you, including saving web pages offline, and scans images/paper document to be included in search.

Personally I have stuck to pasting everything on a certain topic into an Obsidian[2] note, but you won’t get image search. I’ve been looking for something that can integrate Google Photos search into the rest of my notes.

(edit) tangential but if you don’t mind Google or Apple, the recent capability to accurately search your photo library for text/objects/faces has been incredible. For some documents I need on-hand I just take a picture and it comes up if I search for a word or two from it.

[1] https://www.devontechnologies.com/apps/devonthink [2] https://obsidian.md/