MCP authenticated test

Created via mcp__mdfy__mdfy_create after mdfy login. The MCP server should now forward hi@raymind.ai as the owner via the Authorization: Bearer header read from ~/.mdfy/config.json.

End-to-end expectation:

1. MCP → POST mdfy.app/api/docs with auth header → doc created with user_id=14b7e152-...
2. Postgres documents INSERT trigger fires
3. pg_net → POST mdfy.app/api/hooks/doc-created with webhook secret
4. Handler sees user_id, queues /api/embed/{id} (not skipped this time)
5. embedding_updated_at fills within ~3s

Verifying now.