- Added support for Salesforce Platform Events, specifically subscribing to `OrderProvisionRequested__e` to trigger provisioning jobs.
- Introduced new environment variables for Salesforce event configuration, including SF_EVENTS_ENABLED, SF_PROVISION_EVENT_CHANNEL, and SF_PUBSUB_ENDPOINT.
- Refactored order fulfillment process to utilize event-driven architecture, enhancing reliability and scalability.
- Updated documentation to reflect changes in the provisioning workflow and environment variable requirements.
- Removed deprecated webhook handling code to streamline the integration.
- Updated PLESK_DEPLOYMENT.md to include new Salesforce credentials and webhook security configurations.
- Refactored order fulfillment controller to streamline the process and improve readability.
- Introduced EnhancedWebhookSignatureGuard for improved HMAC signature validation and nonce management.
- Updated various documentation files to reflect changes in endpoint naming from `/provision` to `/fulfill` for clarity and consistency.
- Enhanced Redis integration for nonce storage to prevent replay attacks.
- Removed deprecated WebhookSignatureGuard in favor of the new enhanced guard.
