feat: corporate ATS scrapers (Ashby, Greenhouse), O&G, government boards, posted_date fixes

add WorkingNomads + SkipTheDrive scrapers (social media, CS, entry-level focus)

fix: scrapers, cron, design, filters, categories, graduate detection

Fix highimpact.py syntax and method structure

Fix method name mismatches for 80000hours, himalayas, remoteworkng, and realworkfromanywhere

Fix brotli compression issue in base scraper headers

Fix scraper CSS selectors and add error logging

Initial commit: Joblin platform