Update org references from haasonsaas to evalops

[haasonsaas]

Summary

• Repo transferred from haasonsaas to evalops org
• Updated all GitHub URLs, package references, and documentation links from haasonsaas → evalops

🤖 Generated with Claude Code

[cursor]

PR Summary

Low Risk
Low risk documentation-only change that updates the GitHub install command; no runtime or API behavior is modified.

Overview
Updates README.md to point the GitHub install command from haasonsaas/mcp-openapi to evalops/mcp-openapi after the repo/org transfer.

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