fix(php): resolve path import error and ensure ESM compatibility

[mohsenfathipour]

Fixes the PHP binary extraction errors reported in #336 by:

• Properly handling ESM path resolution
• Adding missing environment variable validation
• Ensuring cross-platform compatibility

Changes:
✅ ESM Path Fixes

• Added proper imports for resolve and dirname from path
• Replaced import.meta.dirname with fileURLToPath (ESM standard)
• Fixed join() operations that could receive undefined values

✅ Error Prevention

• Added validation for NATIVEPHP_PHP_BINARY_PATH
• Added validation for NATIVEPHP_PHP_BINARY_VERSION
• Clear error messages for missing requirements

✅ Tested Environments

Platform	Arch	Status
macOS	x86	✔️
macOS	ARM64	✔️
Windows	x64	✔️
Linux	x64	✔️

Impact:

• Resolves PHP binary deployment failures in production builds
• Prevents silent failures when env vars are missing
• Maintains compatibility with Electron's ESM requirements

---

Verification Steps

1. Configure environment:

   export NATIVEPHP_PHP_BINARY_PATH="/path/to/php/binaries"
   export NATIVEPHP_PHP_BINARY_VERSION="8.3"

2. Test execution:

   node resources/js/php.js

3. Confirm:
   • PHP binary exists at resources/php/php[.exe]
   • Correct permissions set (755/executable)

Closes #336