docs: Updated README, azure.yml for minimum azd version 1.18.0

[Vamshi-Microsoft]

Purpose

This pull request updates the documentation and configuration to require Azure Developer CLI (azd) version 1.18.0 or higher for deployment. The changes ensure that users are clearly informed about the new minimum version requirement and help prevent deployment issues due to outdated tooling.

Documentation and configuration updates:

• Updated the version requirement for azd from 1.15.0 to 1.18.0 in the azure.yaml configuration file.
• Added prominent notes in both the README.md and docs/DeploymentGuide.md to inform users that azd version 1.18.0 or higher is required, including a download link for convenience. [1] [2]
• Corrected the minimum version listed for Azure CLI in the deployment guide to 1.18.0+ for consistency with the azd requirement.

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

[github-actions]

🎉 This PR is included in version 1.1.1 🎉

The release is available on GitHub release

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