QuickBooks MCP Worker

Endpoints:
  GET  /health
  GET  /privacy
  GET  /eula
  GET  /oauth/start        (Intuit QBO connect, requires auth)
  GET  /callback           (Intuit OAuth redirect)
  GET  /oauth/authorize    (MCP OAuth for Grok)
  POST /oauth/token        (MCP OAuth for Grok)
  *    /mcp                (requires MCP OAuth token or MCP_API_KEY)