feat: replace stealth/render_js booleans with FetchMode enum in FetchConfig

Align MCP server with scrapegraph-py PR #82 proxy changes:
- Replace stealth/render_heavy_js/render_js booleans with mode enum
  (auto, fast, js, direct+stealth, js+stealth)
- Rename wait_ms → wait, add timeout, cookies, country params
- Add LlmConfig support (llm_model, llm_temperature, llm_max_tokens)
  to smartscraper, searchscraper, and monitor_create
- Add fetch_config params to smartcrawler_initiate and monitor_create
- Add output_schema support to searchscraper
- Remove deprecated v1 params (website_html, website_markdown, stream,
  total_pages, same_domain_only, time_range, number_of_scrolls)
- Update parameter reference documentation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: VinciGit00