LLM Generate Job Management

This module provides a comprehensive generation job management system for LLM providers.

Features: - Generation job creation and lifecycle management - Provider-specific queue management - Job status tracking and monitoring - Retry and error handling mechanisms - Direct vs. queued generation options - PostgreSQL advisory locking integration

The system supports both direct generation (legacy mode) and queued generation for better resource management and scalability.

Key Changes: - Renamed from llm_generation_job to llm_generate_job - Thread extension now only overrides generate_response() method - Maintains backward compatibility with existing generate() method