feat(telegram): inline button callbacks

[shetty4l]

Summary

• Add inline keyboard button support to Telegram messages via payload.buttons
• Handle callback_query updates when users click inline buttons
• Deduplication via TelegramCallback state class with exists() check

Commits

1. chore: bump @shetty4l/core and add TelegramCallback state class
2. feat(telegram): add inline keyboard types and sendMessage support
3. feat(telegram): add callback query API functions
4. feat(telegram): render buttons from outbox payload
5. feat(telegram): handle callback_query in ingestion loop
6. test: add callback handling tests

Validation

All checks pass: typecheck, lint, format, 250 tests, dashboard build

Closes shetty4l/cortex#59