kep75 role deploy coordination

[bcfre]

Ⅰ. Motivation

Enables users to define cross-role deploy steps, ensuring that Pods across different roles maintain the desired ratio even when cluster resources are constrained. It also provides fine-grained scheduling control at the role level.

Ⅱ. Modifications

kep proposal

Ⅲ. Does this pull request fix one issue?

fixes #112

Ⅳ. List the added test cases (unit test/integration test) if any, please explain if no tests are needed.

Ⅴ. Describe how to verify it

VI. Special notes for reviews

Checklist

• Format your code make fmt.
• Add unit tests or integration tests.
• Update the documentation related to the change.

[gemini-code-assist]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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