PepTok public catalog API

Read-only JSON for peptide and protocol (stack) discovery. CORS is enabled for GET.

• GET /api/public/health
• GET /api/public/categories
• GET /api/public/peptides
• GET /api/public/protocols
• GET /api/public/openapi.json (OpenAPI 3.1)
• API catalog (RFC 9727)
• POST /api/mcp (MCP JSON-RPC)

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