Remove [0] Exit option - script is part of main workflow

This script is a component of the larger main script, so it should NOT
have its own exit option. Users should NOT be able to exit this script
directly.

Changes:
1. Removed [0] Exit from menu display (line 298)
2. Updated prompt from "0-5, C, R" to "1-5, C, R"
3. Removed case 0) block that returned 0
4. Removed unreachable return 0 safety statement after while loop

RESULT: Script is now truly infinite
- Menu loops forever
- All user interactions loop back to menu
- NO way to exit except external control (Ctrl-C, kill, etc.)
- Fits properly as component of main workflow

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

modules/backup/mysql-restore-to-sql.sh

@@ -295,9 +295,8 @@ show_step_menu() {
     echo "  [5] Go to Step 5 (Create SQL dump)"
     echo "  [C] Compare original vs recovered database"
     echo "  [R] Review current state"
-    echo "  [0] Exit"
     echo ""
-    echo -n "Select action (0-5, C, R): "
+    echo -n "Select action (1-5, C, R): "
     return 0
 }
 
@@ -3183,13 +3182,6 @@ main() {
                 show_current_state
                 press_enter
                 ;;
-            0)
-                # Exit
-                echo ""
-                echo "Exiting MySQL Restore Script"
-                press_enter
-                return 0
-                ;;
             *)
                 print_error "Invalid option: $menu_choice"
                 press_enter
@@ -3197,9 +3189,7 @@ main() {
         esac
     done
 
-    # SAFETY: This line should never be reached (loop is infinite)
-    # But if it somehow is, return 0 to exit gracefully
-    return 0
+    # Loop is infinite - script never exits naturally
 }
 
 # Run main function