Task: integrate the zxc with google oss-fuzz to enable 24/7 continuous fuzzing and memory safety analysis.

The project currently uses clusterfuzzlite for PR and batchs fuzzing. Keep clusterfuzzlite for PR but batch fuzzing with GitHub Runners will be replaced by oss-fuzz 24/7 continuous fuzzing.

TODO: Removes schedule and simplifies mode with juste code-change in fuzzing.yml workflow.

Moving to oss-fuzz will provide deeper coverage and proactive detection of edge-case vulnerabilities in the core C engine.