throw exception in case of unexpected response

[eugeneg-aya]

What does this PR do?

throw exception in case of unexpected response https://github.com/appwrite/php-clamav/issues/36

Summary by CodeRabbit

• Bug Fixes
  • Improved malware scan reliability with stricter validation of scanner responses.
  • More accurate clean vs. infected detection to reduce false results.
  • Clearer error reporting when scans return unexpected or malformed responses, helping troubleshooting.

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