Handle Ombi API object-format requestedUser field

The Ombi API returns requestedUser as an OmbiUser object instead of a string.
Add extractRequestedUser helper to extract username from various fields
(alias, userAlias, userName, normalizedUserName) with fallback to legacy string format.
Update client and server routes to use the helper for consistent username extraction.

server/utils/ombiHelpers.js

@@ -0,0 +1,31 @@
+/**
+ * Helper functions for extracting user information from Ombi API responses.
+ * The Ombi API returns requestedUser as an OmbiStore.Entities.OmbiUser object,
+ * not a string, so we need to extract the username from the object.
+ */
+
+/**
+ * Extracts the username from an Ombi request object.
+ * Handles both the OmbiUser object format and legacy string format.
+ * 
+ * @param {Object} request - The Ombi request object
+ * @returns {string} The extracted username, or empty string if not found
+ */
+function extractRequestedUser(request) {
+  if (!request) return '';
+  
+  // Handle object format: OmbiStore.Entities.OmbiUser
+  if (request.requestedUser && typeof request.requestedUser === 'object') {
+    // Priority: alias > userAlias > userName > normalizedUserName
+    return request.requestedUser.alias || 
+           request.requestedUser.userAlias || 
+           request.requestedUser.userName || 
+           request.requestedUser.normalizedUserName || '';
+  }
+  // Handle string format (fallback for compatibility)
+  return request.requestedUser || request.requestedByAlias || '';
+}
+
+module.exports = {
+  extractRequestedUser
+};