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)

savemachineedit.asp

@@ -3,7 +3,7 @@
 ' FILE: savemachineedit.asp
 ' PURPOSE: Update existing machine with nested entity creation (vendor, model, business unit)
 ' SECURITY: Parameterized queries, HTML encoding, input validation
-' CREATED: 2025-11-07 - Based on savemachine_direct.asp
+' CREATED: 2025-11-07 - Based on savemachinedirect.asp
 ' NOTE: Machines now inherit machinetypeid from their model. Each model has one machine type.
 '=============================================================================
 %>