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>

addnotification.asp

@@ -311,7 +311,7 @@
 
                 <div class="form-group">
                   <div class="custom-control custom-checkbox">
-                    <input type="checkbox" class="custom-control-input" id="isshopfloor" name="isshopfloor" value="1">
+                    <input type="checkbox" class="custom-control-input" id="isshopfloor" name="isshopfloor" value="1" checked>
                     <label class="custom-control-label" for="isshopfloor">Show on Shopfloor Dashboard</label>
                   </div>
                   <small class="form-text text-muted">Check this to display on the shopfloor TV dashboard (72-hour window)</small>