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fix(controller): resolve variable shadowing causing IPAM key mismatch in per-interface static IP allocation (#6484)

In acquireStaticAddressHelper, the `key` parameter (namespace/podName) was
shadowed by `key := perInterfaceIPAnnotationKey(...)`, causing the annotation
key to be passed to acquireStaticAddress instead of the pod key. This resulted
in IPAM registering the IP under the wrong owner, so ReleaseAddressByNic on
pod deletion could not find and release the IP, leading to IP leaks in
per-interface NAD static IP scenarios.

Signed-off-by: Mengxin Liu <liumengxinfly@gmail.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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