fix(ascii): replace all non-ASCII chars in Python source files

fix(BUG-C5): GemScraper never returns fake sample data; returns None/[] with explicit warning on failure

fix(security): remove real API key from repo, fix gem_scraper bugs

fix(scrapers): correct GeM stats endpoint, use gem.gov.in/statistics

fix(scrapers): load DataGov API key from .env, remove hardcoded key

feat(scrapers): add GeM government contracts scraper