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)

displaymachine.asp

@@ -168,7 +168,7 @@
                     <a href="javascript:void();" data-target="#applications" data-toggle="pill" class="nav-link"><i class="zmdi zmdi-apps"></i> <span class="hidden-xs">Applications</span></a>
                 </li>
                 <li class="nav-item">
-                    <a href="./machine_edit.asp?machineid=<%=Server.HTMLEncode(machineid)%>" class="nav-link" style="background: linear-gradient(45deg, #667eea 0%, #764ba2 100%); color: white;"><i class="zmdi zmdi-edit"></i> <span class="hidden-xs">Edit Machine</span></a>
+                    <a href="./machineedit.asp?machineid=<%=Server.HTMLEncode(machineid)%>" class="nav-link" style="background: linear-gradient(45deg, #667eea 0%, #764ba2 100%); color: white;"><i class="zmdi zmdi-edit"></i> <span class="hidden-xs">Edit Machine</span></a>
                 </li>
             </ul>
             <div class="tab-content p-3">