Handle engine override in TTS options

[TiTidom-RC]

This pull request updates the logging and engine override handling in the generateTTS and playTTS methods of ttscast.class.php. The main focus is to improve how TTS engine overrides are detected from options and to enhance the logging for better traceability.

Key improvements:

Engine override detection and logging:

• Both generateTTS and playTTS now parse the engine field from the JSON options string to detect if an engine override is requested, and this override is reflected in the log output. [1] [2]

Logging enhancements:

• The log messages now include both the original and overridden TTS engine (if applicable), as well as relevant file or UUID and a preview of the text, making debugging and monitoring easier. [1] [2]

Code cleanup:

• Old commented-out logic and redundant debug logs have been removed for clarity and maintainability. [1] [2]