fix(mcp): cache result of discoverServerTools to prevent post-OAuth refetch storm #4701

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Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_be079e1f-7245-4a32-97bd-d297bf9a9163

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^{Reviewed by Cursor Bugbot for commit 4e6210c. Configure here.}