Revert "PCs: identify by hostname/serial, drop the PC Number field"

This reverts commit 76ca95cc57.

frontend/src/views/pcs/PCsList.vue

@@ -24,6 +24,7 @@
           <table>
             <thead>
               <tr>
+                <th>Asset Tag</th>
                 <th>Hostname</th>
                 <th>Serial Number</th>
                 <th>Type</th>
@@ -35,6 +36,7 @@
             </thead>
             <tbody>
               <tr v-for="item in computers" :key="item.assetid">
+                <td>{{ item.assetnumber }}</td>
                 <td>{{ item.computer?.hostname || '-' }}</td>
                 <td class="mono">{{ item.serialnumber || '-' }}</td>
                 <td>{{ item.computer?.computertypename || '-' }}</td>
@@ -59,7 +61,7 @@
                 </td>
               </tr>
               <tr v-if="computers.length === 0">
-                <td colspan="7" style="text-align: center; color: var(--text-light);">
+                <td colspan="8" style="text-align: center; color: var(--text-light);">
                   No computers found
                 </td>
               </tr>