[Docs] Update the high-level architecture diagram

[Yohansenanayake]

Summary

Updates the high-level architecture diagram in the main README to reflect the revised Open Cloud Data Center architecture.

Changes

• Updated the architecture diagram with the latest design.
• Refreshed the rounded-corner image used by the README.
• Clarified the IaC and GitOps workflows shown in the diagram.
• No API, CLI, UI, or Terraform interfaces were changed.

Testing

• Verified that the updated diagram renders correctly.
• Confirmed the original 1362 × 822 dimensions and image content are preserved.
• Confirmed the transparent rounded corners are applied correctly.
• Ran git diff --check successfully.

Checklist

• Tests / validation for the changed area pass
• Docs updated if behaviour or interfaces changed
• No secrets, tokens, or kubeconfigs committed
• No internal or other-repository names, private hostnames, or environment names included

[coderabbitai]

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