mc-dispatcher-standup-endpoint-is-post-api-standup-not-generate

The mc-dispatcher Python daemon was originally calling /api/standup/generate to trigger daily standup auto-generation. The correct endpoint is POST /api/standup (the generate endpoint is a sub-path that behaves differently). Also, mc-dispatcher uses x-api-key header for authentication, not Authorization: Bearer — mixing these headers causes silent 401s that look like network errors in logs.