Delete dir

docs: add screenshots to README

chore: untrack .github, DEVELOPER_GUIDE.md, and eng.traineddata

refactor: humanise comments — short file headers, remove section dividers

docs: rewrite README with setup guide, features, roadmap, and known issues

refactor: separate route definitions from controller logic

docs: update DEVELOPER_GUIDE with all post-launch changes

fix: authenticated signature image display and copy

fix: add standardFontDataUrl, better logging, and re-extract endpoint

fix: authenticated downloads — replace <a href> / window.open with fetch+Blob

feat: extract signature region as PNG using pdfjs + node-canvas

fix: signature detection now actually works — text-anchor approach

docs: expand DEVELOPER_GUIDE to 1723 lines with deep conceptual explanations

docs: add DEVELOPER_GUIDE.md — full technical walkthrough with code

feat: category filter, category editing, and light/dark theme switch