Harden topology editor save/discover flow and edge editing.

Guard unsaved changes, cancel discovery, block invalid links, preserve discovered_at on PUT, and normalize interface names for discovery keys.

Co-authored-by: Cursor <cursoragent@cursor.com>

web/src/i18n/zh.ts

@@ -888,6 +888,8 @@ const zh = {
     paletteHint: "点击或拖到画布添加",
     filterPh: "筛选名称 / IP",
     save: "保存",
+    saveDirty: "保存 *",
+    unsavedConfirm: "有未保存的更改，确定丢弃并切换吗？",
     saving: "保存中…",
     saved: "拓扑已保存",
     discover: "发现全量链路",
@@ -897,6 +899,10 @@ const zh = {
     discoverFail: "发现失败：{{detail}}",
     discoverOneNeedNe: "该节点未关联可扫描网元",
     selectMap: "请选择或新建一张拓扑图",
+    renameNode: "重命名",
+    renameNodePrompt: "网元显示名称",
+    sourcePort: "本端端口",
+    targetPort: "对端端口",
     canvasHint:
       "工具栏切换选择/平移/拖动/连线；框选多选；布局可自动构图。蓝虚线=发现链路，红虚线=未发现。快捷键 V/H/A/C，Ctrl+Z 撤销。",
     selected: "已选节点",
@@ -970,6 +976,7 @@ const zh = {
     paletteLoading: "加载中…",
     discoverReport: "发现进度",
     discoverClose: "关闭",
+    discoverCancel: "取消发现",
     discoverProgress: "正在扫描画布上 {{count}} 台托管网元（串行登录采集 LLDP，请稍候）…",
     discoverProgressLive: "正在扫描 {{index}}/{{total}}：{{name}}",
     discoverSummary: "扫描 {{scanned}} 台 · 新增 {{added}} · 更新 {{updated}} · 未发现 {{stale}} · 失败 {{failed}}",