Split topology page into modules and hooks; add SVG/XML export.

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

web/src/i18n/en.ts

@@ -1601,6 +1601,14 @@ const en = {
     edgeDiscovered: "LLDP",
     edgeStale: "Missing",
     fit: "Fit view",
+    export: "Export",
+    exportSvg: "SVG vector",
+    exportXml: "XML data",
+    exporting: "Exporting…",
+    exportEmpty: "Nothing on the canvas to export",
+    exportedSvg: "SVG exported",
+    exportedXml: "XML exported",
+    exportFailed: "Export failed: {{detail}}",
     liveSync: "Live sync",
     liveSyncOn: "Syncing…",
     liveSyncHint: "Poll the tree about every 5s and the open map every 3s (watch MCP create/draw). Off by default",

web/src/i18n/zh.ts

@@ -1586,6 +1586,14 @@ const zh = {
     edgeDiscovered: "LLDP 发现",
     edgeStale: "未发现",
     fit: "适应画布",
+    export: "导出",
+    exportSvg: "SVG 矢量",
+    exportXml: "XML 数据",
+    exporting: "导出中…",
+    exportEmpty: "画布上没有可导出的内容",
+    exportedSvg: "已导出 SVG",
+    exportedXml: "已导出 XML",
+    exportFailed: "导出失败：{{detail}}",
     liveSync: "实时同步",
     liveSyncOn: "同步中…",
     liveSyncHint: "开启后约每 5 秒刷新左侧树、每 3 秒刷新当前画布（观看 MCP 建图/画拓扑）；默认关闭",