- import_subscribers: was POSTing wrong bulk shape AND fallback used 'list_ids'
(ignored by Listmonk) instead of 'lists' -> subscribers never attached to the
list -> real sends would go to an empty list. Now single-adds with 'lists',
handles already-exists, returns a count, logs if 0 added.
- send_test: passed base['lists'] (objects) instead of IDs -> test send rejected.
Now extracts list IDs.
- create_and_schedule_campaign: add schedule= flag (preview makes drafts).
- --preview: 1 sample carrier/campaign, only owner email, drafts not scheduled,
test sends immediately, never marks real carriers sent.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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