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)

displayprofile.asp

@@ -497,7 +497,7 @@ End If
                     </div>
 
                     <div class="mt-2">
-                        <a href="./usb_history.asp?sso=<%=Server.URLEncode(sso)%>" class="btn btn-outline-primary btn-sm">
+                        <a href="./usbhistory.asp?sso=<%=Server.URLEncode(sso)%>" class="btn btn-outline-primary btn-sm">
                             <i class="zmdi zmdi-open-in-new"></i> View Full History
                         </a>
                     </div>