feat: Add bulk actions for help center articles (translate, status change, delete) (#14137)

Fixes
https://linear.app/chatwoot/issue/CW-6950/support-bulk-actions-for-publish-archive-move-to-draft-delete-in

How to test

1. Go to Help Center → Articles
2. Select articles using checkboxes → bulk bar appears
3. Click Publish/Draft/Archive → articles update, list refreshes
4. Click Delete → confirmation dialog → articles removed
5. Click Translate (requires Captain enabled) → select locale + category
→ translation starts
6. Try translating to a locale that already has translations → warning
with links to existing articles → "Overwrite and translate" proceeds
8. Single article: click three-dot menu → Translate → same dialog opens
for that article



https://github.com/user-attachments/assets/7c76495e-f89e-4456-92bd-a6639a9992f4

---------

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

app/javascript/dashboard/api/helpCenter/articles.js

@@ -79,6 +79,20 @@ class ArticlesAPI extends PortalsAPI {
       { ids: articleIds, locale, category_id: categoryId, force }
     );
   }
+
+  bulkUpdateStatus({ portalSlug, articleIds, status }) {
+    return axios.patch(
+      `${this.url}/${portalSlug}/articles/bulk_actions/update_status`,
+      { ids: articleIds, status }
+    );
+  }
+
+  bulkDelete({ portalSlug, articleIds }) {
+    return axios.delete(
+      `${this.url}/${portalSlug}/articles/bulk_actions/delete_articles`,
+      { data: { ids: articleIds } }
+    );
+  }
 }
 
 export default new ArticlesAPI();