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)

displayprinters.asp

@@ -31,7 +31,7 @@
             <div class="card-body">
               <div style="display:flex; justify-content:space-between; align-items:center; margin-bottom:15px;">
                 <h5 class="card-title" style="margin:0;">
-                  <a href="./printermap.asp" target="_blank"><i class='zmdi zmdi-map' title='Show Printer Map' style='color:#fff;'></i></a>&nbsp&nbsp<a href="./tonerreport.asp" target="_blank"><i class='zmdi zmdi-collection-image text-yellow' title='Low Toner Report'></i></a>&nbsp&nbsp<a href="./printer_installer_map.asp" target="_blank"><i class='zmdi zmdi-download' title='Printer Installer Map' style='color:#fff;'></i></a>&nbsp&nbsp&nbsp&nbsp;Printers
+                  <a href="./printermap.asp" target="_blank"><i class='zmdi zmdi-map' title='Show Printer Map' style='color:#fff;'></i></a>&nbsp&nbsp<a href="./tonerreport.asp" target="_blank"><i class='zmdi zmdi-collection-image text-yellow' title='Low Toner Report'></i></a>&nbsp&nbsp<a href="./printerinstallermap.asp" target="_blank"><i class='zmdi zmdi-download' title='Printer Installer Map' style='color:#fff;'></i></a>&nbsp&nbsp&nbsp&nbsp;Printers
                 </h5>
                 <div>
                   <a href="./addprinter.asp" class="btn btn-primary">
@@ -103,7 +103,7 @@
 			If installpath <> "" Then
 				Response.write("<td><a href='./" & installpath & "'><i class='zmdi zmdi-download' title='Click to Download Specific Installer' style='color:#fff;'></i></a></td>")
 			Else
-				Response.write("<td><a href='./install_printer.asp?printerid=" & printer & "'><i class='zmdi zmdi-download' title='Click to Download Universal Driver Installer' style='color:#fff;'></i></a></td>")
+				Response.write("<td><a href='./installprinter.asp?printerid=" & printer & "'><i class='zmdi zmdi-download' title='Click to Download Universal Driver Installer' style='color:#fff;'></i></a></td>")
 			End If
 
 			' ID column