feat(admin-web): localize template wizard for en-US articles

Drive the wizard off the article locale instead of the UI locale so an
en-US article stays in English end to end, and stop Chinese values from
leaking into English drafts.

- Localize review-intro-hook copy and outline section labels to English
  (with fallbacks), and use a ": " separator for en-US
- Sanitize CJK content from titles, outline, and key points when the
  article locale is en-US, and re-sanitize on locale switch/draft restore
- Add knowledge-base reference labels/placeholders and the
  missing-review-intro-hook validation message to both locales

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/admin-web/src/i18n/messages/en-US.ts

@@ -981,6 +981,7 @@ const enUS = {
         generatedOutline: 'Confirm outline',
         outlinePreview: 'Outline preview',
         keyPoints: 'Key points',
+        knowledgeGroups: 'Knowledge base references',
         review: 'Review',
         notes: 'Notes',
         inputParams: 'Input params',
@@ -1063,6 +1064,7 @@ const enUS = {
         customTitle: 'Override the AI title here if needed',
         customOutline: 'Add another section, for example “Buying advice”',
         keyPoints: 'Add any extra instructions, key angles, or constraints for the article',
+        knowledgeGroups: 'Optional, used to enrich the article context and factual background',
         competitorWebsite: 'Official site or landing page',
         competitorName: 'Competitor name',
         competitorDescription: 'One-line positioning or summary',
@@ -1111,6 +1113,7 @@ const enUS = {
         selectBrandBeforeQuestion: 'Select the current company in the top bar before continuing.',
         missingPrimaryQuestion: 'Choose one primary brand question.',
         missingTitle: 'Please choose or enter an article title.',
+        missingReviewIntroHook: 'Choose one review intro hook first.',
         missingOutline: 'Please select at least one outline section.',
         missingGeneratedOutline: 'Please generate and confirm the article outline first.',
         customOutlineTooLong: 'Custom sections cannot exceed {count} characters.',

apps/admin-web/src/i18n/messages/zh-CN.ts

@@ -954,6 +954,7 @@ const zhCN = {
         generatedOutline: '确认文章大纲',
         outlinePreview: '大纲预览',
         keyPoints: '文章关键要点',
+        knowledgeGroups: '引用知识库',
         review: '提交前确认',
         notes: '生成说明',
         inputParams: '输入参数',
@@ -1028,6 +1029,7 @@ const zhCN = {
         customTitle: '如需覆盖 AI 标题，可在这里直接输入',
         customOutline: '补充一个额外结构，例如“选购建议”',
         keyPoints: '告诉 AI 还需要强调哪些要点、风格或限制条件',
+        knowledgeGroups: '可选，用于补充文章内容和事实背景',
         competitorWebsite: '官网或落地页地址',
         competitorName: '竞品名称',
         competitorDescription: '一句话说明竞品定位或特点',