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docs: add Underlay kubelet probe connectivity solution - #862
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When the node management network is isolated from the Underlay workload network, kubelet probes can fail even when an outbound route exists. Add English guidance for IPv4 Underlay subnets in the default VPC that use a physical gateway (
spec.vlanconfigured,logicalGateway: false).The article explains U2O, join-CIDR ACLs, and table 200 policy routing, including source address selection and the return path. It includes three SVG diagrams, two route persistence methods, verification, and troubleshooting/recovery steps. Chinese content is generated by the existing translation workflow after merging into main.
Validation:
git diff --check: passed.