feat: implement comprehensive audit logging system

audit/diffObject.js

@@ -0,0 +1,40 @@
+function diffObject(before = {}, after = {}, parentPath = "") {
+  const changes = [];
+
+  const allKeys = new Set([
+    ...Object.keys(before || {}),
+    ...Object.keys(after || {}),
+  ]);
+
+  for (const key of allKeys) {
+    const beforeValue = before?.[key];
+    const afterValue = after?.[key];
+    const currentPath = parentPath ? `${parentPath}.${key}` : key;
+
+    // Nếu cả hai đều là object (không phải array)
+    if (
+      typeof beforeValue === "object" &&
+      typeof afterValue === "object" &&
+      beforeValue !== null &&
+      afterValue !== null &&
+      !Array.isArray(beforeValue) &&
+      !Array.isArray(afterValue)
+    ) {
+      changes.push(...diffObject(beforeValue, afterValue, currentPath));
+      continue;
+    }
+
+    // So sánh primitive hoặc array
+    if (JSON.stringify(beforeValue) !== JSON.stringify(afterValue)) {
+      changes.push({
+        field: currentPath,
+        before: beforeValue,
+        after: afterValue,
+      });
+    }
+  }
+
+  return changes;
+}
+
+module.exports = diffObject;