feat: add orphaned app cleanup — auto-filter stale discovered apps, manual dismiss with data purge

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cameleer3-server-app/src/main/resources/application.yml

@@ -57,6 +57,8 @@ cameleer:
     indexer:
       debouncems: ${CAMELEER_SERVER_INDEXER_DEBOUNCEMS:2000}
       queuesize: ${CAMELEER_SERVER_INDEXER_QUEUESIZE:10000}
+    catalog:
+      discoveryttldays: ${CAMELEER_SERVER_CATALOG_DISCOVERYTTLDAYS:7}
     license:
       token: ${CAMELEER_SERVER_LICENSE_TOKEN:}
       file: ${CAMELEER_SERVER_LICENSE_FILE:}