Release v1.1.1

• Automatically clamp notification expiry between 5 minutes and 24 hours (Amazon's allowed limits) with clear warning logs when adjusted.
• Auto-recovery: refresh expired access tokens automatically on 401 errors and retry.
• Enhanced /notify response: now includes reference_id and effective expiry_hours.
• Enhanced /history: added optional ?limit=N query parameter.
• Home Assistant integration: updated rest_command and UI script examples to support expiry_hours.