Improve paid seed product outputs

[itosa-kazu]

Summary

• Replace static vendor-lead-discovery output with live GitHub/Pyrimid catalog discovery, scoring, source metadata, and ranked leads.
• Replace static mcp-server-audit output with runtime inspection for HTTP endpoints and GitHub repos, plus readiness scoring, paid-tool recommendations, x402 route shape, catalog metadata, and risk notes.
• Keep existing payment verification behavior intact; the richer payload is only built after a valid payment proof.

Verification

• npx tsc --noEmit
• npm run build
• npx --yes tsx -e "import { buildVendorLeadDiscovery } from './lib/paid-product-output.ts'; (async () => { const r = await buildVendorLeadDiscovery({ segment: 'mcp', limit: '3' }); console.log(JSON.stringify({ segment: r.segment, source_count: r.sources.length, lead_count: r.leads.length, first_lead: r.leads[0] }, null, 2)); })();"
• npx --yes tsx -e "import { buildMcpServerAudit } from './lib/paid-product-output.ts'; (async () => { const r = await buildMcpServerAudit({ url: 'https://github.com/pyrimid-ai/pyrimid' }); console.log(JSON.stringify({ status: r.audit.status, score: r.audit.monetization_readiness_score, grade: r.audit.readiness_grade, kind: r.inspection.kind, paid_tools: r.audit.recommended_paid_tools.slice(0, 3), risks: r.audit.risk_notes }, null, 2)); })();"