feat(user_scan): add 100 username OSINT modules across non-developer categories

[kaifcodec]

Summary

Adds 100 new username OSINT detection modules across 8 non-developer categories with rich metadata extraction and strict dual-state verification.

• Finance (18): brevo, consultoria_sap, deriv, emma_app, fireblocks, invoiceninja, jelurida, jup, kitco, leasehackr, mergado, metamask, peercoin, ramp, tawk, toggl, vtex, zcashcommunity
• Gaming (18): crateentertainment, duelistsunite, entropiauniverse, gamernation, hitmanforum, insertcredit, ishtar_collective, kingdomcomerpg, neverwintervault, nianticspatial, norestforthewicked, online_go, quartertothree, revolutionarygames, sourceruns, stepsmash, trictrac, warthunder
• Community (15): bambulab, calculate_linux, emacs_china, freifunk, garudalinux, geocommuns, hiveos, ilovegrowingmarijuana, inaturalist, infinityfree, mapillary, openmandriva, sandisk, welcome_suisse, wer_weiss_was
• Learning (14): crossref, etymonline, freemdict, itvdn, lang_learning_netflix, languagetool, lsst, mmcs, osvita, p2pu, sorumatik, uit, worldhistory, zorin
• Social (10): aztec, cosmos, dronehub, eeclub, joinmastodon, ministryoftesting, polkadot, rocket_chat, scrt, signalusers
• Entertainment (9): dramatica, filmfind, logik_tv, mediaspy, rocketbeans, shotcut, sonarr, trakt, ttvchannel
• Creative (8): cartridgecollectors, frame_io, icons8, inkdrop, inventables, silver_collector, sketchup, zazzle
• Music (8): bcharts, dastereo, elektronauts, futureaudioworkshop, moogmusic, rembetiko, renoise, steinberg

Highlights

• Explicitly zero developer category additions to balance catalog diversity across other domains.
• Zero false positives: dual-state verified against both existing and non-existent handles.
• Validates explicit not-found error payloads on HTTP 404 responses (error_type == 'not_found' / 'not be found' in errors).
• Extracts rich profile metadata (name, bio, location, website, trust_level, badges, joined) and profile media (avatar).
• Local CI passed: ruff check ., mypy user_scanner (883 files), and pytest (385 passed).