Clean API models and keychain helpers

Sources/KeychainHelper.swift

@@ -9,7 +9,7 @@ import Foundation
 import Security
 
 enum KeychainHelper {
-    static func save(apiKey: String, for hostname: String) {
+    static func saveApiKey(_ apiKey: String, for hostname: String) {
         let data = Data(apiKey.utf8)
         let query: [String: Any] = [
             kSecClass as String: kSecClassGenericPassword,