Update sysadmin_agent.php

Merge branch 'main' of https://github.com/paolomulas/datapizza-ai-php

update FEB-26

Correct author name and add reuse reference note

Update repository URL in README

Delete quick_demo.php

Aggiornamento completo quick_demo.php: ciclo input, breakout solo con q, scrive trigger file per il monitor.

Update PHP version badge to 8.x

Update PHP version requirement to 8.2

fix elevenlabs client

fix elevenlab client

Add ElevenLabs TTS example script

Add ElevenLabs Text-to-Speech client implementation

Add ElevenLabs TTS client - AI audio generation on Raspberry Pi

Update hello_pizza.php