WP Command Center MCP proxy.

Upstream:   https://wp.dev3.smartbits.hu/mcp
Issuer:     https://auth.dev3.smartbits.hu
Public URL: https://wpcc.mcp.dev3.smartbits.hu

POST /mcp with `Authorization: Bearer <pocketid-access-token>`.
Discovery: /.well-known/oauth-protected-resource