Remove donor-site leftovers

[jehrr]

Removes text and data inherited from the repos this one was bootstrapped from, which described another site as if it were dubizzle.

Fixed

• User-visible strings: scraper_api_client.py description ("auction scraper", scrolling grid, /p/<cat> URL help); diff_runs.py --price-tolerance-pct ("quotes IDR"); Playwright --pages help (infinitely scrolling search); Playwright --concurrency warning ("refuses a headless browser ... answering NOTHING at all").
• Core/engine prose: Akamai 394-byte headless refusal, --mode product/--mode shop, unaddressable search and /p/<slug> hub comments in all three engines, captcha_solver.py and output_writer.py — replaced with the Imperva / UAE-exit facts from this repo's README and page_flow.py, or deleted. Contradictory "HEADFUL by default" comments removed (the default is headless, as the code and suite already say). Unused shop_facts dataclass field removed from the engines.
• diff_runs.py: euro / 18 locales / auction and bid prose -> AED, two languages, Car of the Week lifecycle bucket; donor example filenames.
• CONTRIBUTING.md: "Reporting a site change" rewritten for __NEXT_DATA__, the JSON-LD path join and the DOM fallback; the datacentre "no response at all" note corrected; the pyppeteer first-fetch crash attributed to the sibling (tokopedia-scraper).
• Issue templates: site_changed options for reserve prices, favorite_count, suggested lots, a 100-page cap, "headless is refused", and two orphaned donor lines; bug_report example --out grills / "96 products".
• .gitignore / .dockerignore: dubizzle_listings.* -> dubizzle_products.* (the engines' real --out default; _*.* covers dubizzle_products_scraperapi).
• smoke_test.py: CATAWIKI_CDP_ENDPOINT / CATAWIKI_PROXY -> DUBIZZLE_* (same assertions); EUR comment -> AED.
• README: last badge "runs without an account" -> "needs a UAE exit" (the README's own "Do you need any of the paid products?" says a UAE exit is required). Badge order was already the family order.
• CHANGELOG [Unreleased] entry; no version bump.

Kept deliberately

• farfetch-scraper / Kohl's provenance in captcha_solver.py, the craigslist .env* note in .gitignore: explicit sibling provenance.
• "a dubizzle run and a mediamarkt run with the same code" in output_writer.py: family schema statement.
• The "sibling repos' auction columns are NOT tracked" check in smoke_test.py: a guard, phrased as sibling.
• <captcha-widgets> / _Incapsula_Resource notes in product_parser.py and CONTRIBUTING: stated as measured on this site's own 17 captures.
• Released CHANGELOG sections untouched.
• Repo description/topics: no donor leftovers, unchanged.

Suite: smoke_test: OK before and after (engine groups skipped, no engine installed); ci_checks.py --secret-check and --help-check --sample-check green.

🤖 Generated with Claude Code