feat: comprehensive CMS improvements

- Fix DOMPurify SSR crash (use isomorphic-dompurify)
- Fix SanitizedHtml to sanitize by default
- Add auth guards to studio/catalog maintenance pages
- Add update/edit to vouchers CRUD
- Add update/edit to rare-values CRUD
- Add approve workflow to applications page
- Add edit form to guilds detail page
- Add SEO metadata to all public pages (21 pages)
- Fix mobile nav accessibility (focus trap, aria attributes)
- Fix missing labels and table accessibility
- Add dynamic imports for heavy client components (6 components)
- Fix silent error swallowing (40+ locations)
- Add content scheduling for articles (publishAt, status)
- Wire up 12 missing webhook notification triggers
- Add global search to admin panel
- Add bulk actions to admin users table
- Fix JSON formatting and a11y issues

src/db/schema.ts

@@ -660,6 +660,9 @@ export const WebsiteArticles = mysqlTable("website_articles", {
 	image: varchar("image", { length: 255 }).notNull(),
 	createdAt: timestamp("created_at"),
 	updatedAt: timestamp("updated_at"),
+	status: varchar("status", { length: 20 }).notNull().default("published"),
+	publishAt: timestamp("publish_at"),
+	publishedAt: timestamp("published_at"),
 });
 
 export const WebsiteLanguages = mysqlTable("website_languages", {