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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
I'm personally a big fan of digitizing as you go, since that is ultimately what is going to make the images the most accessible for you and your family. Even if you aren't going to make high resolution scans, a cell phone image of the photo provides a great opportunity to compile notes and related resources in a more accessible digital format. A resource I can highly recommend is called Tropy (https://tropy.org/), a free program created specifically to assist in organizing and arranging photographs and research notes. You can include granular information such as the box and folder the item is located in, transcriptions and captions for the images, and even tag and link related materials (such as tagging by surname, linking census records, and grouping images together like pages of a photo album or front and back of documents).