fix: use async_is_safe_url() in async web tool functions

[memosr]

web_extract_tool() and web_crawl_tool() are async but called is_safe_url() which blocks the event loop during DNS resolution. Switch to the new async_is_safe_url() added in url_safety.py.

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• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 🔒 Security fix
• 📝 Documentation update
• ✅ Tests (adding or improving test coverage)
• ♻️ Refactor (no behavior change)
• 🎯 New skill (bundled or hub)

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