update emergency contact student controller

app/Services/Settings/ConfigurationService.php

@@ -46,4 +46,12 @@ class ConfigurationService
 
         return (bool) $config->delete();
     }
+
+    public function getByKey(string $key): ?Configuration
+    {
+        return Configuration::query()
+            ->where('config_key', $key)
+            ->orderByDesc('id')
+            ->first();
+    }
 }