Fix docs audit: wrong auth header, broken links, updated report

- Fix api-reference.mdx: Authorization: Bearer → X-Browser-Use-API-Key
- Fix proxies.mdx: internal link to correct /create-browser-session path
- Fix browser-use-cli.mdx: dead profile-use repo → browser-use-cli
- Fix mcp-server.mdx: dead examples/mcp link → examples
- Update audit report with 14-agent comprehensive results

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

Author: MagMueller