Unify manual topology roots with UME World: auto root map, and fix empty UME canvas.

Top-level folders are nav-only with a unique system root map; UI drops custom/extra L2 creates. Batched dock-to-Fabric apply avoids PG lock OOM so World NEs can render, with subtree region counts restored.

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

web/src/i18n/zh.ts

@@ -1385,7 +1385,11 @@ const zh = {
     maps: "拓扑图",
     tree: "拓扑树",
     treeLoading: "加载拓扑树…",
-    treeHint: "区域下为画布列表；点图打开设备画布（区域本身不自动建图）。",
+    graphLoading: "正在加载拓扑图…",
+    graphRefreshing: "刷新中…",
+    canvasEmpty: "这张图上还没有网元",
+    canvasEmptyHint: "可用「添加网元」上图，或从左侧换到有设备的区域。",
+    treeHint: "顶级为「根」（导航）；其下唯一「根图」为画布。点根图或子区域打开设备画布。",
     treeSearch: "全拓扑搜索网元",
     treeSearchPh: "名称 / IP",
     treeSearchEmpty: "没有匹配的网元",
@@ -1393,47 +1397,47 @@ const zh = {
     treeSearchNotOnMap: "该网元尚未出现在任何拓扑图上",
     treeSearchViewCount: "{{count}} 张图",
     treeSearchTruncated: "仅显示前 30 条（共 {{total}}）",
-    rootName: "区域",
-    selectRegion: "请选择区域",
+    rootName: "根",
+    selectRegion: "请选择根或区域",
     openMap: "打开本图",
-    openRegion: "打开区域",
+    openRegion: "打开",
     kindPhysical: "物理拓扑",
     kindCustom: "自定义图",
     regionNodeHint: "{{count}}P",
     layerNodeHint: "{{count}} 个网元",
     layerNodeEmpty: "点击创建并打开",
-    rootCanvasHint: "从左侧选择区域进入目录。",
-    regionCanvasHint: "点击图打开设备画布，或新建自定义图。",
-    regionBrowseHint: "区域目录：自行添加的画布。点击打开。",
+    rootCanvasHint: "从左侧选择根进入目录。",
+    regionCanvasHint: "点击根图打开设备画布；可在根图上新建子区域。",
+    regionBrowseHint: "根目录：下方为唯一根图。点击打开。",
     browserTitle: "拓扑目录",
     browserRegionSub: "共 {{count}} 张拓扑图",
-    browserRegionsSub: "共 {{count}} 个区域",
-    browserEmptyMaps: "此区域还没有拓扑图。",
+    browserRegionsSub: "共 {{count}} 个",
+    browserEmptyMaps: "此根下还没有根图。",
     addNe: "添加网元",
-    backUp: "返回区域",
-    newRegion: "新建区域",
-    newRegionName: "新区域",
-    newRegionPrompt: "区域名称",
+    backUp: "返回",
+    newRegion: "新建根",
+    newRegionName: "新根",
+    newRegionPrompt: "根名称",
     newSubRegion: "新建子区域",
     newSubRegionName: "新子区域",
     newSubRegionPrompt: "子区域名称",
     subRegionNotOnFlat: "完整世界地图不支持子区域，请在 World 或下级区域画布上创建。",
     worldMapNoDirectNes: "世界地图不能直接添加网元，请到某个子区域画布上添加。",
-    subRegionNeedParent: "请先打开一个区域画布，再新建子区域。",
-    regionCreated: "区域已创建",
-    regionDeleted: "区域已删除",
-    deleteRegion: "删除区域",
-    deleteRegionConfirm: "删除区域「{{name}}」？其下画布将一并删除。",
-    renameRegion: "重命名区域",
-    renameRegionPrompt: "区域名称",
-    regionRenamed: "区域已重命名",
-    collapseRegion: "折叠区域",
-    expandRegion: "展开区域",
+    subRegionNeedParent: "请先打开根图或区域画布，再新建子区域。",
+    regionCreated: "已创建",
+    regionDeleted: "已删除",
+    deleteRegion: "删除",
+    deleteRegionConfirm: "删除「{{name}}」？其下画布将一并删除。",
+    renameRegion: "重命名",
+    renameRegionPrompt: "名称",
+    regionRenamed: "已重命名",
+    collapseRegion: "折叠",
+    expandRegion: "展开",
     newCustom: "自定义图",
     newCustomName: "自定义拓扑",
     newCustomPrompt: "自定义拓扑图名称",
-    folderHint: "区域用于分组。新建区域后请自行添加物理拓扑或自定义图。",
-    folderHintShort: "区域目录",
+    folderHint: "新建根时自动创建唯一「根图」。子区域请在根图画布上创建。",
+    folderHintShort: "根目录",
     outsidePeers: "图外对端 {{count}} 个（有链路未上图）",
     projectNeighbors: "投影邻居上图",
     projectedNeighbors: "已投影 {{count}} 个邻居上图",
@@ -1457,7 +1461,7 @@ const zh = {
     renamed: "拓扑图已重命名",
     deleteMap: "删除图",
     deleteMapConfirm: "删除拓扑图「{{name}}」？节点与链路会一并删除。",
-    emptyMaps: "还没有区域，先点「新建区域」。",
+    emptyMaps: "还没有根，先点「新建根」。",
     palette: "网元库",
     paletteHint: "勾选后批量添加；也可拖到画布添加单台",
     paletteDragHint: "拖到画布添加",