docs: add EasyTier CNI guide

[fanyang89]

Summary

• add Chinese and English guides for deploying EasyTier as a Multus secondary CNI
• document prerequisites, security boundaries, Whereabouts configuration, Pod attachment, and lifecycle operations
• document coexistence with Flannel as the primary CNI, including deployment order and prerequisites
• add the guide to both sidebars and introduction pages

Dependency

This documentation depends on EasyTier/EasyTier#2496. Merge or publish it together with the CNI implementation so the linked manifests are available on the main branch.

Validation

• pnpm lint
• pnpm docs:build
• clean three-node Kind v0.32.0 run with the default kindnet disabled
• Kubernetes v1.36.1, Flannel v0.28.9, Multus v4.3.0, and Whereabouts v0.9.4
• cross-node EasyTier ping and HTTP between Pods on different workers
• Flannel primary-network Service/DNS access, TUN MTU, CNI deletion, and IPAM release

The clean Flannel run completed without manual intervention: EasyTier CNI kind integration passed: 10.200.0.10 -> 10.200.0.11.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
doc	Ready	Preview	Aug 14, 2026 1:43pm