feat(SECURITY): :lock: Implement rate limiting for API endpoints and update request handling for text generation and summarization.

feat: :lock: Implement API Key authentication and CORS configuration for enhanced security. Don`t returns thread ID

feat(EXCEPTION_HANDLING): :bug: Implement general exception handler and improve error responses for text generation and summarization

refactor(app.py): :sparkles: Improve response handling and streamline configuration for model invocation

feat(ENDPOINT): :pushpin: Add new summarize endpoint

First commit