[Claude] Support claude/anthropic

[rrr63]

$response = Agent::using(Claude::class)
    ->withKey('')
    ->model('claude-sonnet-4-20250514')
    ->prompt('Generate a PHP function to validate email')
    ->send();

[techmahedy]

@rrr63 great, Claude is so popular, so we badly need this and finally you did it.