fix: allow access to h2 console

After implementing security, the h2 console is no longer accessible

Akzeptanzkriterien:

• Web-Interface der H2-Console ist vollständig aufrufbar und verwendbar

added Backend Technische Anforderung labels

assigned to @lk224

mentioned in commit 2f8dd9dd

mentioned in commit c410cad3

mentioned in merge request !8 (merged)

mentioned in commit 88ae3db0

mentioned in commit b7159bb1

closed