phase-7: code restructure

server/utils/Chunker.ts

@@ -0,0 +1,15 @@
+/**
+ * Split an array into smaller chunks of specified size.
+ * @param array The array to split
+ * @param size The size of each chunk
+ * @returns Array of chunks
+ * @example chunkArray([1,2,3,4,5], 2) → [[1,2], [3,4], [5]]
+ */
+export const chunkArray = <T>(array: T[], size: number): T[][] => {
+  const chunkCount = Math.ceil(array.length / size);
+  return Array.from({ length: chunkCount }, (_, index) => {
+    const start = index * size;
+    const end = start + size;
+    return array.slice(start, end);
+  });
+};