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)

apibusinessunits.asp

@@ -0,0 +1,48 @@
+<%@ Language=VBScript %>
+<%
+Response.ContentType = "application/json"
+Response.Charset = "UTF-8"
+Response.AddHeader "Access-Control-Allow-Origin", "*"
+Response.AddHeader "Cache-Control", "no-cache, no-store, must-revalidate"
+%><!--#include file="./includes/sql.asp"--><%
+
+Dim strSQL, jsonOutput, isFirst
+
+strSQL = "SELECT businessunitid, businessunit " & _
+         "FROM businessunits " & _
+         "WHERE isactive = 1 " & _
+         "ORDER BY businessunit ASC"
+
+Set rs = objConn.Execute(strSQL)
+
+jsonOutput = "{""success"":true,""businessunits"":["
+isFirst = True
+
+Do While Not rs.EOF
+    If Not isFirst Then jsonOutput = jsonOutput & ","
+    isFirst = False
+
+    jsonOutput = jsonOutput & "{"
+    jsonOutput = jsonOutput & """businessunitid"":" & rs("businessunitid") & ","
+    jsonOutput = jsonOutput & """businessunit"":""" & JSEscape(rs("businessunit") & "") & """"
+    jsonOutput = jsonOutput & "}"
+
+    rs.MoveNext
+Loop
+
+rs.Close
+jsonOutput = jsonOutput & "]}"
+
+Response.Write jsonOutput
+
+Function JSEscape(s)
+    Dim r
+    r = s
+    r = Replace(r, "\", "\\")
+    r = Replace(r, """", "\""")
+    r = Replace(r, Chr(13), "")
+    r = Replace(r, Chr(10), "\n")
+    r = Replace(r, Chr(9), "\t")
+    JSEscape = r
+End Function
+%>