docs: finalize SE5420 deployment guide per review

- Reorder §3.3: create VLAN66/55 before SVI; keep VLAN1 until management path verified
- Fix §3.4 verification port wording (enabled VLAN66 access port, e.g. port 6)
- Harden VLAN10 phase: PVE boundary, gfw NAT/IPv6 policy, rollback order, verification chain
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windyboy
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# LAN 核心交换机升级计划(保留 ER-X)
**状态:** SE5420 **已采购**2026-08-09)。**实施与验证以 [lan-se5420-deployment-guide.md](lan-se5420-deployment-guide.md) 为准**
本文保留为设计/阶段划分参考
本文为历史规划参考,**不得作为现场执行步骤**;所有实际操作均以部署指南为准
**锁定硬件:** TP-Link **`TL-SE5420`**16 × 2.5GbE RJ45 + 4 × 10GbE SFP+)。
**目标:** SE5420 承接全部 LAN 物理接入与二层转发;ER-X 继续承担公网、NAT、防火墙、
LAN66/LAN55 网关与 DHCP。