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/configSync.ts

@@ -0,0 +1,58 @@
+const configSync = {
+  title: "Config sync",
+  syncNow: "Sync now",
+  retryFailed: "Retry failed",
+  pause: "Pause",
+  resume: "Resume",
+  stop: "Stop",
+  confirmStop: "Stop this cycle and cancel remaining NE tasks?",
+  started: "Sync cycle started",
+  paused: "Paused",
+  resumed: "Resumed",
+  stopped: "Sync cycle stopped",
+  policyTitle: "Sync policy",
+  policySaved: "Policy saved",
+  enabled: "Enable scheduled sync",
+  intervalDays: "Interval (days)",
+  concurrency: "Concurrency",
+  historyKeep: "Config versions to keep",
+  cycleKeep: "Jobs to keep",
+  scope: "Scope",
+  scopeAll: "All NEs",
+  scopeSelected: "Selected NEs",
+  savePolicy: "Save policy",
+  selectedCount: "{{count}} selected",
+  targetKeywordPh: "Name / IP / vendor",
+  cyclesTitle: "Sync cycles",
+  cyclesEmpty: "No sync cycles yet",
+  tasksTitle: "Cycle tasks",
+  taskKeywordPh: "Name / IP / message",
+  keywordPh: "ID / trigger / message",
+  statusAll: "All statuses",
+  allStatus: "All statuses",
+  exportCyclesName: "config-sync-cycles",
+  exportTasksName: "config-sync-tasks",
+  expand: "Details",
+  collapse: "Collapse",
+  kpi: {
+    snapshots: "Snapshots",
+    running: "In progress",
+    idle: "Idle",
+    last: "Last cycle",
+    nextDue: "Next due",
+  },
+  col: {
+    source: "Source",
+    name: "Device",
+    vendor: "Vendor",
+    trigger: "Trigger",
+    status: "Status",
+    progress: "Progress",
+    started: "Started",
+    ended: "Ended",
+    message: "Message",
+    actions: "Actions",
+  },
+};
+
+export default configSync;