ChatGPT params, bug fixes, exact credits, better DX

[sahilsunny]

• ChatGPT --search, --add-html, --country-code flags — the chatgpt command now supports web-enhanced responses, HTML inclusion, and geolocation
• --allowed-domains crawl bug fixed — Scrapy's OffsiteMiddleware was silently filtering all requests through ScrapingBee's proxy; renamed to _cli_allowed_domains to
  avoid the conflict
• --max-depth fixed for non-HTML modes — disabled Scrapy's DepthMiddleware which broke depth tracking when using --ai-query, --return-page-markdown, etc.
• Auto-prepend https:// — URLs without a scheme now get https:// added automatically (like curl/httpie)
• Exact credit costs — --verbose now shows exact costs (e.g. Credit Cost: 10) instead of estimated ranges for all SERP commands
• --extract-field path suggestions — wrong field paths now warn with all available dot-paths instead of silent empty output
• Misleading screenshot warning removed — --screenshot-full-page without --screenshot no longer prints a false warning
• Fast Search credits corrected — fixed from 5 to 10 in the estimated fallback
• Installation docs updated — now recommends uv tool install over pip install
• CLI documentation page — full docs at https://www.scrapingbee.com/documentation/cli/