Add PC-machine relationships API and report, fix shopfloor dashboard

- Add getPCMachineRelationships API endpoint for PC-to-machine mappings
- Add pcmachinerelationships.asp report page with copy table/CSV/JSON export
- Fix shopfloor dashboard to immediately hide deactivated notifications
- Add Firewall (machinetypeid 46) support to network device pages
- Add model migration warning banner to networkdevices.asp
- Create SQL script for hybrid model/machine type view

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

devicefirewall.asp

@@ -240,7 +240,10 @@
     strSQL2 = "SELECT machinetypeid, machinetype FROM machinetypes WHERE isactive = 1 ORDER BY machinetype ASC"
     Set rsMachineTypes = objConn.Execute(strSQL2)
     While Not rsMachineTypes.EOF
-        Response.Write("<option value='" & rsMachineTypes("machinetypeid") & "'>" & Server.HTMLEncode(rsMachineTypes("machinetype")) & "</option>")
+        ' Pre-select Firewall (46) as the default for this form
+        Dim mtSelected
+        If CStr(rsMachineTypes("machinetypeid")) = "46" Then mtSelected = " selected" Else mtSelected = ""
+        Response.Write("<option value='" & rsMachineTypes("machinetypeid") & "'" & mtSelected & ">" & Server.HTMLEncode(rsMachineTypes("machinetype")) & "</option>")
         rsMachineTypes.MoveNext
     Wend
     rsMachineTypes.Close