OpenFGA MCP

# Pull Request ## Summary <!-- What does this PR do in a sentence or two? --> Fixes #<!-- issue number --> ## Type <!-- Check all that apply --> - [ ] Bug fix (non-breaking) - [ ] New feature (non-breaking) - [ ] Breaking change - [ ] Documentation update - [ ] Test improvement - [ ] Performance improvement ## Implementation <!-- Briefly explain your implementation --> ## Testing <!-- How did you verify your changes? --> ```php // Test case using PEST with PsrMock for HTTP mocking, if applicable ``` ## Checklist - [ ] Added tests using PEST with PsrMock for HTTP mocking - [ ] Passing static analysis (PHPStan/Psalm) - [ ] Documentation updated (if needed) - [ ] Follows [PSR-12](https://www.php-fig.org/psr/psr-12/) coding standards - [ ] Commit messages follow conventional commits format