telegram: unified message queue with async/scheduled sends

- Add Messages.hs with scheduled_messages table and dispatcher loop
- All outbound messages now go through the queue (1s polling)
- Disable streaming responses, use runAgentWithProvider instead
- Add send_message tool for delayed messages (up to 30 days)
- Add list_pending_messages and cancel_message tools
- Reminders now queue messages instead of sending directly
- Exponential backoff retry (max 5 attempts) for failed sends

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