feat: add get_organizer_address helper to EventRegistry contract

[Sundriveauto]

Closes #319

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Summary

Centralizes organizer address lookup behind a dedicated public function on the EventRegistry contract.

Changes

event_registry/src/lib.rs

• Added pub fn get_organizer_address(env, event_id) -> Result<Address, EventRegistryError>
  • Returns EventNotFound if the event does not exist
• Refactored authorize_scanner to use the helper instead of fetching the full EventInfo

ticket_payment/src/contract.rs

• Added get_organizer_address to the EventRegistryInterface trait for cross-contract use

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