Add Unstructured Transform MCP integration

[dizon-u10d]

Adds an integration catalog page for Unstructured Transform MCP, a hosted MCP server exposing Unstructured's document-processing pipeline (partition, enrich, chunk, embed) as MCP tools.

• New: integrations/transform-mcp.md (type: Tool Integration)
• Connects via the existing mcp-haystack MCPToolset over Streamable HTTP using StreamableHttpServerInfo's native token parameter; documents the mcp-remote OAuth fallback.
• Reuses the existing /logos/unstructured.svg asset.

Docs: https://docs.unstructured.io/transform/overview · Get started: https://transform.unstructured.io/get-started

Companion cookbook PR: deepset-ai/haystack-cookbook#300

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[dizon-u10d]

Hi @kacperlukawski, following up on this listing for Unstructured Transform MCP (uses the existing mcp-haystack integration, same as integrations/mcp.md).

Verified against the live server: StreamableHttpServerInfo/MCPToolset correctly reaches https://mcp.transform.unstructured.io, and the server returns a clean 401 invalid_token with a spec-compliant OAuth-discovery challenge. One thing worth flagging: with eager_connect=True, an invalid/expired key doesn't surface that 401 right away, it hangs for mcp-haystack's ~30s connection timeout and then raises a generic MCPConnectionError, since the underlying mcp 1.28.1 SDK's streamable-http transport doesn't propagate the HTTP error out of its TaskGroup until the timeout fires. Not a defect in this doc, just something a user hitting a bad key would notice.

The only failing check here is the Vercel preview needing fork authorization. Happy to make any changes.