Fix menu standards: Add RED 0 back buttons to 3 menus

Fixed php-optimizer.sh:
- Changed 'q) Quit' to '0) Exit' with RED color
- Updated case handler to use '0' instead of 'q|Q'

Fixed live-attack-monitor-v2.sh (2 menus):
1. show_blocking_menu:
   - Changed 'Cancel' to 'Back' with RED 0
2. show_security_hardening_menu:
   - Changed 'q) Return to Monitor' to '0) Back' with RED color
   - Updated case handler to use '0' instead of 'q|Q'

Progress: 3/9 menus fixed
Remaining: bot-analyzer (2), malware-scanner (1), live-attack-monitor (2), acronis-logs (1)

modules/performance/php-optimizer.sh

@@ -57,7 +57,7 @@ show_main_menu() {
     cecho "  ${YELLOW}b${NC}) Backup Current Configurations"
     cecho "  ${YELLOW}r${NC}) Restore from Backup"
     echo ""
-    cecho "  ${RED}q${NC}) Quit"
+    cecho "  ${RED}0${NC}) Exit"
     echo ""
     cecho "${CYAN}─────────────────────────────────────────────────────────────────────${NC}"
 }
@@ -1733,7 +1733,7 @@ main() {
             r)
                 restore_configurations
                 ;;
-            q|Q)
+            0)
                 cecho "${GREEN}Exiting PHP Optimizer...${NC}"
                 exit 0
                 ;;