chore: Version 0.9.22 für App und Backend

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

backend/pom.xml

@@ -11,7 +11,7 @@
     <packaging>jar</packaging>
 
     <properties>
-        <revision>0.9.21</revision>
+        <revision>0.9.22</revision>
         <java.version>21</java.version>
         <maven.compiler.source>21</maven.compiler.source>
         <maven.compiler.target>21</maven.compiler.target>