Fix dualpath propagation, getShopfloorPCs filtering, USB management, and printer features

- Fix dualpath PC propagation direction (Equipment->PC) in api.asp and db_helpers.asp
- Fix early exit in CreatePCMachineRelationship preventing propagation
- Fix getShopfloorPCs to filter machinetypeid IN (33,34,35) instead of >= 33
- Fix getShopfloorPCs to show equipment numbers via GROUP_CONCAT subquery
- Add detailed PropagateDP logging for dualpath debugging
- Default "Show on Shopfloor Dashboard" checkbox to checked in addnotification.asp
- Add USB label batch printing, single USB labels, and USB history pages
- Add printer supplies tracking and toner report enhancements
- Add uptime map visualization page
- Add dashboard/lobby display SQL migration
- Update CLAUDE.md with IIS 401 workaround documentation
- Update TODO.md

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

displayusb.asp

@@ -75,6 +75,9 @@
                   <a href="./addusb.asp" class="btn btn-success btn-sm">
                     <i class="zmdi zmdi-plus-circle"></i> Add USB
                   </a>
+                  <a href="./usblabelbatch.asp" class="btn btn-info btn-sm" target="_blank">
+                    <i class="zmdi zmdi-label"></i> Batch Print Labels
+                  </a>
                 </div>
               </div>
 
@@ -176,6 +179,9 @@
                       <a href="./usbhistory.asp?machineid=<%=machineId%>" class="btn btn-sm btn-secondary" title="View history">
                         <i class="zmdi zmdi-time"></i>
                       </a>
+                      <a href="./usbsingle.asp?machineid=<%=machineId%>" class="btn btn-sm btn-info" title="Print barcode label" target="_blank">
+                        <i class="zmdi zmdi-label"></i>
+                      </a>
                     </td>
                   </tr>
 <%