fix: initialize port-forward namespace and address flags from provide…

[Samyra312007]

What type of PR is this?

/kind bug

What this PR does / why we need it:

Fixes pkg/kube.NewPortForwarder() so that newPortForwarder() initializes the Cobra namespace and address flags from the ns and localAddress arguments passed by the caller instead of the hardcoded KmeshNamespace (kmesh-system) and DefaultLocalAddress (localhost) defaults.

Previously the supplied namespace and bind address were stored in the portForwarder struct but never reflected in the Cobra flags, so the port-forward command bound to localhost regardless of the requested localAddress and exposed an inconsistent namespace flag value. Existing callers pass ""/kmesh-system, so behavior is preserved for them.

Also adds unit tests in pkg/kube/portforwarder_test.go covering flag initialization, the localhost fallback, dynamic port selection, and struct field population.

Which issue(s) this PR fixes:
Fixes #1879

Special notes for your reviewer:

NONE

Does this PR introduce a user-facing change?:

NONE

[kmesh-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign lizhencheng9527 for approval. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• pkg/OWNERS

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[kmesh-bot]

Welcome @Samyra312007! It looks like this is your first PR to kmesh-net/kmesh 🎉

[codecov]

Codecov Report

❌ Patch coverage is 52.63158% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 39.95%. Comparing base (5bf8ed1) to head (10c1b38).
⚠️ Report is 20 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/kube/portforwarder.go	47.05%	9 Missing ⚠️

❌ Your patch check has failed because the patch coverage (52.63%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Files with missing lines	Coverage Δ
pkg/kube/client.go	38.98% <100.00%> (+38.98%)	⬆️
pkg/kube/portforwarder.go	27.08% <47.05%> (+27.08%)	⬆️

... and 5 files with indirect coverage changes

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[LiZhenCheng9527]

/retest