Initial

server/models/helpModel.js

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+import { helpCatalog, helpCategories, helpSearch } from '../data/helpCatalog.js';
+
+export function listHelp({ query = '', category = '' } = {}) {
+  const articles = helpSearch(query, category);
+  return {
+    categories: helpCategories(),
+    total: articles.length,
+    articles: articles.map((item) => ({
+      id: item.id,
+      category: item.category,
+      title: item.title,
+      summary: item.summary,
+      tags: item.tags || []
+    }))
+  };
+}
+
+export function getHelpArticle(articleId) {
+  return helpCatalog().find((item) => item.id === articleId) || null;
+}