Evolution API v5.5.1

Outbound queue fixes\n\n- Enforces combined sent + queued capacity for instance and recipient minute/day limits.\n- Enforces the unique new/dormant outreach daily limit.\n- Rejects a new queue item when its calculated send time is more than the configured distance after the current queue tail.\n- Adds OUTBOUND_QUEUE_MAX_TAIL_GAP_SECONDS, defaulting to 120 seconds.\n- Returns detailed 429 responses with capacity totals or queue-horizon timing.\n- Adds worker delivery, reschedule, and failure logging.\n\nThe v5.5.0 worker was confirmed to run correctly: it delivered one due message and rescheduled the others because only one outreach quota slot was available. This release prevents that queue over-admission and exposes the reason clearly.\n\nCloses #35.