Fix "undefined index" in YamlConfigLoader for casted values

src/Config/Loaders/YamlConfigLoader.php

@@ -30,7 +30,7 @@ class YamlConfigLoader implements ConfigLoaderInterface
             // App settings
             'appTitle' => $parsedConfig['appTitle'] ?? null,
             'environment' => $parsedConfig['environment'] ?? null,
-            'debug' => (bool)$parsedConfig['debug'] ?? null,
+            'debug' => isset($parsedConfig['debug']) ? (bool)$parsedConfig['debug'] : null,
             'timezone' => $parsedConfig['timezone'] ?? null,
             'dateTimeFormat' => $parsedConfig['dateTimeFormat'] ?? null,
 
@@ -39,7 +39,7 @@ class YamlConfigLoader implements ConfigLoaderInterface
 
             // Database settings
             'databaseHost' => $parsedConfig['database']['host'] ?? null,
-            'databasePort' => (int)$parsedConfig['database']['port'] ?? null,
+            'databasePort' => isset($parsedConfig['database']['port']) ? (int)$parsedConfig['database']['port'] : null,
             'databaseName' => $parsedConfig['database']['name'] ?? null,
             'databaseUsername' => $parsedConfig['database']['username'] ?? null,
             'databasePassword' => $parsedConfig['database']['password'] ?? null,