feat: enrich MCP server audit output

[mateoalifraco]

Summary

• replace the generic mcp-server-audit payload with a structured monetization audit
• classify submitted targets as GitHub repos, MCP endpoints, API endpoints, or registry listings
• return prioritized paid tool candidates, pricing, x402 route shape, catalog metadata, risk notes, and launch checklist

Bounty

MYA/Pyrimid job #26: improve mcp-server-audit output ($20 USDC)

Payout

Base USDC: 0x97620eB52A577cabc95911099E88e83115eB7C20

Verification

• npx tsc --noEmit
• npm run build
• git diff --check
• secret scan over diff: no real secrets/tokens/keys (only instructional text mentioning API keys)