docs: fix EnvUtils path in Example samples

[ClausYang]

Updated the incorrect EnvUtils path in both README.md and README_zh.md to match the actual project structure.

📝 Description

Brief description of the changes in this PR.

🔄 Type of Change

Please check the applicable options:

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 🔧 Refactoring (code change that neither fixes a bug nor adds a feature)
• 📚 Documentation update
• 🧪 Test improvement
• 🚀 Performance improvement
• 🎨 Style/UI change

🧪 Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing completed
• All existing tests pass

📋 Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

🔗 Related Issues

Closes #(issue number)

📸 Screenshots (if applicable)

Add screenshots here if UI changes are involved.

📋 Additional Notes

Any additional information that reviewers should know.

[ClausYang]

@willishz @linkerzhang @jiashiwen