feat(mcp): add Search1API hosted MCP preset

[fatwang2]

Search1API (https://s1.dev) is a hosted MCP for web search, news, crawl, sitemap, and trending. Endpoint https://mcp.search1api.com/mcp. tools/list works without a key; tool calls use OAuth 2.1 or a Bearer API key (same pattern as other hosted MCPs in this list). Icon is the official mark at https://s1.dev/logo.png.

[fatwang2]

Hi - friendly ping on this preset PR (open since Aug 28). The hosted MCP at mcp.search1api.com is stable; happy to adjust the preset shape or add anything the review needs. Thanks!

[fatwang2]

Update: since #1851 moved the connect flow onto the integrations.sh registry, Search1API is now listed there instead: https://integrations.sh/s1.dev/

Its surface document resolves the MCP connect target to https://mcp.search1api.com/mcp (OAuth 2.1 with DCR, or an API key), plus the REST API with its OpenAPI spec at https://api.search1api.com/openapi.json.

That likely makes this preset redundant. Happy to close it, unless you would still like a hosted MCP preset here.

[RhysSullivan]

We're clearing the backlog ahead of the v2 launch, so we're closing this. If it still applies to v2, please open a new issue or PR against v2.

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