[sn-platform][sn-platform-slim]: move kop ports and auth configurations to broker.kop

[ericsyh]

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Motivation

To make the kop configuration under the same location.

Modifications

move kop ports and auth configurations to broker.kop

Verifying this change

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This change is a trivial rework / code cleanup without any test coverage.

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This change added tests and can be verified as follows:

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• Added integration tests for end-to-end deployment with large payloads (10MB)
• Extended integration test for recovery after broker failure

Documentation

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