List visible packs with pagination and optional public-pack inclusion
1-100.include_public only accepts literal query values true or false.
Any other value falls back to default behavior (true).422 invalid_query - query params failed validation401 - authentication failed (missing/invalid/revoked token)402 subscription_required - active Creator/Professional/Business plan required403 tier_not_allowed - Scheduler tier cannot use Partner API500 packs_list_failed - unexpected listing failure