תזמור Stateless לארכיטקטורת Base44

Implement the 'Base44 Stateless Orchestrator' pattern for this project.
We are moving away from tradition Session-based storage to a pure stateless event-driven architecture.

CORE REQUIREMENTS:
1. Every API call MUST be idempotent.
2. Use the Base44 'Contextual Singleton' to pass LLM-specific state without storing it in a persistent SQL database if not necessary.
3. Implement 'AI-Security-Headers': Validate that every incoming prompt has been sanitized by the Base44 Gateway before it hits the application logic.
4. Write the implementation for a 'Task Worker' that handles long-running AI generations using background job orchestration (Base44 Workers).