Add MCP client credentials documentation

[mintlify]

Summary

• Documents the new client credentials feature for MCP servers, which enables programmatic machine-to-machine access without interactive OAuth login.
• Adds a "Client credentials" subsection to the MCP page with step-by-step instructions for generating credentials, requesting access tokens, and connecting to the MCP server.

What shipped

MCP servers now support the client_credentials OAuth grant type. Users can generate client credentials from the dashboard for automated systems, CI/CD pipelines, or backend services that need to access authenticated MCP servers without going through the interactive login flow.

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Note

Low Risk
Documentation-only change that adds guidance for using the client_credentials grant; no product logic or security behavior is modified in this PR.

Overview
Adds a new Client credentials section to the Model Context Protocol docs, describing machine-to-machine authentication for authenticated MCP servers.

Includes steps for generating credentials in the dashboard, exchanging them for an access token via POST /mcp/oauth/token (with example curl + response payload), and using the bearer token to connect; also documents credential deletion/revocation behavior.

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