Fix "Resource parameter is required" error in Sitecore Marketers MCP

Connecting new Marketers MCP into your LLM client is easy, but with some clients you can face an issue with authorization.

This is how it looks:

Fix: manually append resource parameter to the request url.

&resource=https%3A%2F%2Fedge-platform.sitecorecloud.io%2Fmcp%2Fmarketer-mcp-prod

Note. The issue is confirmed by Sitecore (currently the documentation is updated). Also Sitecore Support is working on better permanent solution (Feature Request #AI-6473).

Proposed fix: make resource param optional with default value https://edge-platform.sitecorecloud.io/mcp/marketer-mcp-prod