Add web fetch tool support for Anthropic

[Shulyaka]

Proposed change

Add web fetch server tool support for Anthropic

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • I've opened up a PR to add logos and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

• Link to parent pull request in the codebase: Add web fetch tool support for Anthropic core#167405
• Link to parent pull request in the Brands repository:
• This PR fixes or closes issue: fixes #

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

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[Copilot]

Pull request overview

Adds documentation updates to reflect newly supported Anthropic “Web fetch” server-side tool usage in Home Assistant’s Anthropic integration docs.

Changes:

• Document new options for enabling Web fetch and limiting maximum web fetches.
• Update the Anthropic feature matrix to mark Web fetch as supported and point to the new option.
• Provide security/pricing context for the Web fetch tool in the options section.