Support data-driven tables (#57806)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

src/data-directory/middleware/data-tables.ts

@@ -0,0 +1,26 @@
+import type { NextFunction, Response } from 'express'
+import { ExtendedRequest } from '@/types'
+import { getDeepDataByLanguage } from '@/data-directory/lib/get-data'
+
+let tablesCache: Record<string, unknown> | null = null
+
+// Lazy loading function
+const getTables = () => {
+  if (!tablesCache) {
+    // Keep product-name-heavy reference tables in English only for now
+    tablesCache = getDeepDataByLanguage('tables', 'en')
+  }
+  return tablesCache
+}
+
+/**
+ * Middleware that loads data-driven table content into the request context.
+ * Tables are sourced from YAML files in data/tables/ directory.
+ */
+export default async function dataTables(req: ExtendedRequest, res: Response, next: NextFunction) {
+  if (!req.context) throw new Error('request not contextualized')
+
+  req.context.tables = getTables()
+
+  return next()
+}