* In server/index.js
- add get/post handlers for /mcp
- amend console log on SSE connect, with deprecation message
- add /stdio GET handler and refactored /sse GET handler to not also do stdio. Each transport has its own handler now
- add appropriate headers to streamable-http request
* In /client/src/lib/hooks/useConnection.ts
- in connect function
- create server url properly based on new transport type.
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