feat: enrich mcp server audit output

[qingfeng312]

Summary

• Expands the mcp-server-audit paid response with URL normalization, transport and readiness signals, structured paid-tool recommendations, pricing tiers, Pyrimid listing metadata, risk checks, and validation checks.
• Preserves a compatibility list for existing consumers that expect simple recommended tool names.

Testing

• Not run locally; dependency installation did not complete.