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)

displayprinter.asp

@@ -189,7 +189,7 @@
 			IF rs("installpath") & "" <> "" THEN
 				response.write ("<a href='./" & Server.HTMLEncode(rs("installpath") & "") & "' title='Download Specific Installer'><i class='zmdi zmdi-download' style='font-size:1.2rem; color:#007bff;'></i> <span style='color:#007bff;'>Specific Installer</span></a>")
 			ELSE
-				response.write ("<a href='./install_printer.asp?printerid=" & Server.HTMLEncode(printerid) & "' title='Download Universal Driver Installer'><i class='zmdi zmdi-download' style='font-size:1.2rem; color:#28a745;'></i> <span style='color:#28a745;'>Universal Installer</span></a>")
+				response.write ("<a href='./installprinter.asp?printerid=" & Server.HTMLEncode(printerid) & "' title='Download Universal Driver Installer'><i class='zmdi zmdi-download' style='font-size:1.2rem; color:#28a745;'></i> <span style='color:#28a745;'>Universal Installer</span></a>")
 			END IF
 %>
                             </p>