Replace machinetypeid 33-43 checks with pctypeid throughout codebase

- PCs now identified by pctypeid IS NOT NULL (not machinetypeid >= 33)
- Equipment identified by pctypeid IS NULL (not machinetypeid < 33)
- Updated 8 files: search.asp, savemachineedit.asp, displaymachine.asp,
  displaypc.asp, displaypcs.asp, machine_map.asp, displaymachines.asp, api.asp
- Simplified queries and removed redundant machinetypeid checks
- Updated all related comments to reflect new pattern

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

displaypc.asp

@@ -373,7 +373,7 @@ strControlledEquipSQL = "SELECT m.machineid, m.machinenumber FROM machinerelatio
                         "JOIN relationshiptypes rt ON mr.relationshiptypeid = rt.relationshiptypeid " & _
                         "JOIN machines m ON mr.related_machineid = m.machineid " & _
                         "WHERE mr.machineid = ? AND rt.relationshiptype = 'Controls' AND mr.isactive = 1 " & _
-                        "AND m.machinetypeid < 33 LIMIT 1"
+                        "AND m.pctypeid IS NULL LIMIT 1"
 Set rsControlledEquip = ExecuteParameterizedQuery(objConn, strControlledEquipSQL, Array(machineid))
 
 If rsControlledEquip.EOF Then
@@ -383,7 +383,7 @@ If rsControlledEquip.EOF Then
                             "JOIN relationshiptypes rt ON mr.relationshiptypeid = rt.relationshiptypeid " & _
                             "JOIN machines m ON mr.machineid = m.machineid " & _
                             "WHERE mr.related_machineid = ? AND rt.relationshiptype = 'Controls' AND mr.isactive = 1 " & _
-                            "AND m.machinetypeid < 33 LIMIT 1"
+                            "AND m.pctypeid IS NULL LIMIT 1"
     Set rsControlledEquip = ExecuteParameterizedQuery(objConn, strControlledEquipSQL, Array(machineid))
 End If
 
@@ -495,7 +495,7 @@ End If
                             <tbody>
 <%
     ' Query machines that THIS PC controls
-    ' Check both directions - the equipment is identified by machinetypeid NOT IN (33-43)
+    ' Check both directions - the equipment is identified by pctypeid IS NULL
     strSQL2 = "SELECT m.machineid, m.machinenumber, mt.machinetype, mo.modelnumber, 'Controls' as relationshiptype " & _
               "FROM machinerelationships mr " & _
               "JOIN machines m ON (mr.machineid = m.machineid OR mr.related_machineid = m.machineid) " & _