Standardize ASP filenames: remove underscores

Renamed 45 ASP files to follow lowercase concatenated naming convention:
- Direct handlers: save_machine_direct.asp -> savemachinedirect.asp
- USB files: checkin_usb.asp -> checkinusb.asp
- API files: api_usb.asp -> apiusb.asp
- Map files: network_map.asp -> networkmap.asp
- Printer files: printer_lookup.asp -> printerlookup.asp

Also:
- Updated 84+ internal references across all ASP and JS files
- Deleted 6 test/duplicate files (editmacine.asp, test_*.asp)
- Updated production migration guide with filename changes
- Added rename scripts for Linux (bash) and Windows (PowerShell)

displaymachines.asp

@@ -34,7 +34,7 @@
             <div class="card-body">
               <div style="margin-bottom:15px;">
                 <div style="display:flex; justify-content:space-between; align-items:center; margin-bottom:15px;">
-                  <h5 class="card-title" style="margin:0;"><a href="./machine_map.asp" target="_blank"><i class='zmdi zmdi-map' title='Show Machine Map'></i></a>&nbsp;&nbsp;&nbsp;&nbsp;Machines</h5>
+                  <h5 class="card-title" style="margin:0;"><a href="./machinemap.asp" target="_blank"><i class='zmdi zmdi-map' title='Show Machine Map'></i></a>&nbsp;&nbsp;&nbsp;&nbsp;Machines</h5>
                   <div>
                     <a href="./addmachine.asp" class="btn btn-primary">
                       <i class="zmdi zmdi-plus-circle"></i> Add Machine