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)

search.asp

@@ -272,7 +272,7 @@ Set rs = Nothing
 	</ul>
             <div class="tab-content p-3">
                 <div class="tab-pane" id="additem">
-			<form method="post" action="./addlink_direct.asp">
+			<form method="post" action="./addlinkdirect.asp">
                         <div class="form-group row">
                             <label class="col-lg-3 col-form-label form-control-label">Description:</label>
                             <div class="col-lg-9">