Refactor web UI: feature-first structure, tokenized styles, modern blue theme.

Structure
- pages/ -> features/<domain>/{Page, components, hooks, lib}; 95 files moved,
  333 imports rewritten, verified with tsc.
- services/api.ts -> services/api/<domain>.ts (250 exports preserved),
  types.ts -> types/<domain>.ts, i18n zh/en -> locales/<lang>/<namespace>.ts
  (2696 messages deep-equal before/after).
- ESLint rule: shared layers must not import features/.

Styles
- index.css (16k lines) split losslessly into styles/{base,layout,components,
  pages,legacy,theme}; compiled CSS was byte-identical before tokenizing.
- ~930 hard-coded colors replaced by --nx-* tokens (theme/tokens.css); WebCRT
  off-palette colors unified; fixed dark-on-dark text introduced by mapping.
- theme/theme.css: modern blue design language (rounded shapes, gradients,
  unified buttons/fields/tables/modals), form-grid alignment fix, flat nav list
  without tree indent, soft selected state instead of left accent bar.

Docs: WEB.md documents code structure and style rules.
Not touched: the large Biz*/Webcrt/Topology page components (to be split later).

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

web/src/i18n/locales/en/common.ts

@@ -0,0 +1,25 @@
+const common = {
+  help: "Help",
+  refresh: "Refresh",
+  refreshing: "Refreshing…",
+  query: "Search",
+  clearFilters: "Clear filters",
+  prevPage: "Previous",
+  nextPage: "Next",
+  perPage: "{{n}}/page",
+  pagerMeta: "{{total}} items · page {{page}}/{{pages}}",
+  jumpPage: "Go to page",
+  pageSize: "Page size",
+  exportCsv: "Export CSV",
+  exporting: "Exporting…",
+  exportOk: "Exported {{count}} rows",
+  exportTruncated: "Exported first {{count}} of {{total}} rows (truncated)",
+  exportFailed: "Export failed",
+  opFailed: "Operation failed",
+  empty: "-",
+  cancel: "Cancel",
+  copy: "Copy",
+  copied: "Copied",
+};
+
+export default common;