[master] [bug] Fix crash in ssh:configure when key generation fails

[JoshSalway]

Summary

KeyRepository::create() calls keysFactory.php via exec() and json_decodes the result without checking for failure. If the subprocess fails (wrong PHP binary, missing dependencies, PHAR path issues), json_decode returns null and the subsequent array access crashes with:

Trying to access array offset on null

This adds an abort_if guard with a helpful error message pointing to the script that failed to execute.

Fixes #96

Before

$ forge ssh:configure
  An unexpected error occured.
  - Error Message: Trying to access array offset on null.

After

$ forge ssh:configure
  Failed to generate SSH key. Ensure PHP can execute /path/to/scripts/keysFactory.php

Testing

forge ssh:configure
# If key generation fails, should show a clear error message
# instead of "Trying to access array offset on null"

Note: I don't have a Laravel Forge subscription and was unable to end-to-end test. I currently use Laravel Cloud for my hosting needs instead.

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