test: add tests for YouTubeDownloader error handling and authentication

feat: update decisionSource assertion to check for auris_ prefix

refactor: improve test function descriptions and structure in test_analyze.py

fix: update audio processing endpoint to default options to all-off when missing

fix: enhance audio processing tests with improved validation and error handling

fix: add tests for auth failure without API key and ensure rate limiting applies regardless of auth

fix: update status code assertions in commend generate tests for better error handling

fix: standardize error response format and update request payload keys in commend endpoints

fix: update audio processing tests to handle multiple error status codes

fix: update analysis and commend endpoints with additional tests and default values

fix: update health check test assertions for correct response keys

refactor: update test client fixture to use context manager for better resource management

feat: add tests for Crown Commend health and generate endpoints

feat: add initial test files for health check and YouTube analysis endpoints