feat(admin-web): preserve template wizard entry source and refresh AI banner

- Carry `from=workspace` query from the workbench into the wizard so cancel
  and post-generate redirects return to the workbench instead of always
  landing on /articles/templates.
- AppShell now resolves an effective navKey from `route.query.from`, so the
  sidebar highlight and breadcrumb track the entry source while inside the
  wizard.
- Redesign the brand-info AI analyze CTA into a standalone banner with
  template-aware copy (default / product_review / research_report) and add
  the matching i18n keys.
- Drop the unused 批量生成文章 button and its styling from the templates
  page.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/admin-web/src/layouts/AppShell.vue

@@ -67,12 +67,23 @@ const membershipExpiryText = computed(() => {
     day: '2-digit',
   }).format(date)
 })
-const selectedKeys = computed(() => {
-  if (route.meta.navKey === null) {
-    return []
-  }
+const navKeyOverrides: Record<string, string> = {
+  workspace: '/workspace',
+}
 
-  return [String(route.meta.navKey ?? route.path)]
+const effectiveNavKey = computed<string | null>(() => {
+  if (route.meta.navKey === null) {
+    return null
+  }
+  const from = route.query.from
+  if (typeof from === 'string' && navKeyOverrides[from]) {
+    return navKeyOverrides[from]
+  }
+  return String(route.meta.navKey ?? route.path)
+})
+
+const selectedKeys = computed(() => {
+  return effectiveNavKey.value ? [effectiveNavKey.value] : []
 })
 const pageTitle = computed(() => t(String(route.meta.titleKey ?? 'route.workspace.title')))
 
@@ -165,7 +176,7 @@ const navSections = computed<NavSection[]>(() => {
 
 const headerBreadcrumbs = computed<HeaderBreadcrumb[]>(() => {
   const currentTitle = pageTitle.value
-  const navKey = route.meta.navKey === null ? null : String(route.meta.navKey ?? route.path)
+  const navKey = effectiveNavKey.value
 
   if (!navKey) {
     return [{ label: currentTitle }]