Fix FileCountLimitExceededException on multipart uploads

Tomcat 10.1.42+ limits total multipart parts (files + form fields) to
50 by default. Wicket/React forms with many hidden fields exceed this.
Raise to 200.

Author: kreinhard

projectforge-business/src/main/resources/application.properties

@@ -163,6 +163,9 @@ projectforge.security.csp-header-value=default-src 'self' data:; script-src 'sel
 # Upload sizes
 spring.servlet.multipart.max-file-size=100MB
 spring.servlet.multipart.max-request-size=110MB
+# Max number of parts (files + form fields) per multipart request. Tomcat 10.1.42+ defaults to 50.
+# Wicket/React forms with many hidden fields may exceed this, causing FileCountLimitExceededException.
+server.tomcat.max-part-count=200
 projectforge.max-file-size.datev=3MB
 projectforge.max-file-size.xml-dump-import=10MB
 projectforge.address.maxImageSize=5MB