feat(#27): Set up consola logger, make use of log levels in backend and frontend

legalconsenthub/app/pages/callback.vue

@@ -4,10 +4,11 @@
 
 <script setup lang="ts">
 onMounted(async () => {
+  const logger = useLogger().withTag('auth callback')
   try {
     await navigateTo('/')
   } catch (e) {
-    console.error('Error during login', e)
+    logger.error('Error during login', e)
   }
 })
 </script>