refactor(nav): use exit code 75 to suppress redundant "Press Enter" prompt

- app submenus return 75 on back/exit instead of 0
- index menus capture child exit code and skip pause when rc is 75
- applies to apps (coolify, pterodactyl, uptime-kuma, cloudpanel, proxmox) and tools (server-benchmark, system-infos) indexes

tools/server-benchmark.sh

@@ -28,13 +28,7 @@ SCORE_NETWORK_LATENCY=0
 # ═══════════════════════════════════════════════════════════════════════════
 
 show_header() {
-    echo -e "${WHITE}${BOLD}"
-    echo "╔═══════════════════════════════════════════════════════════════════════════╗"
-    echo "║                                                                           ║"
-    echo "║                      SERVER PERFORMANCE BENCHMARK                         ║"
-    echo "║                                                                           ║"
-    echo "╚═══════════════════════════════════════════════════════════════════════════╝"
-    echo -e "${NC}"
+    show_box_top "SERVER PERFORMANCE BENCHMARK"
 }
 
 install_dependencies() {
@@ -760,4 +754,5 @@ fi
 
 # Execute main function
 main
+exit 75