feat: Add readiness probe for Kmesh daemon

[ravjot07]

• Implemented an HTTP readiness probe on port 8080 with a /ready endpoint.
• The probe returns HTTP 200 (OK) when the daemon is ready and HTTP 503 (Not Ready) otherwise.
• Uses an atomic flag to track readiness state.
• Integrated with Kubernetes readinessProbe for health checks.
• Ensures the Kmesh daemon is only marked ready after successful initialisation.

Test Build kmeshctl Ensure the daemon is running, then:

./kmeshctl readiness

If the daemon is ready, you see “Kmesh daemon is ready!”, otherwise you see a non-zero exit.

Check Readiness Manually You can manually check the readiness probe using curl:

curl -X GET http://localhost:8080/ready

If the daemon is ready, it will return:

OK with HTTP 200 (OK).

If it is not ready, it will return:

Not Ready with HTTP 503 (Service Unavailable).

Fixes #495

[kmesh-bot]

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[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 45.24%. Comparing base (2eb3f92) to head (7588563). :warning: Report is 486 commits behind head on main. see 1 file with indirect coverage changes

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