Show IP address in audit log table and expanded detail row

- Add IP column to the logs table (hidden on mobile)
- Fix expanded detail row condition: also expands when ip_address is set
  even if there is no JSON details blob (login/logout events have ip_address
  but null details, so they previously could not be expanded at all)
- Show ip_address as a plain line above the JSON blob in the detail row
- Update colspan from 6 to 7 for the new column

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/views/LogsView.vue

@@ -198,6 +198,7 @@ function clearFilters() {
               <th>Category</th>
               <th class="hide-mobile">User</th>
               <th>Action / Endpoint</th>
+              <th class="hide-mobile">IP</th>
               <th class="hide-mobile">Status</th>
               <th class="hide-mobile">Duration</th>
             </tr>
@@ -220,6 +221,7 @@ function clearFilters() {
                   <span v-if="entry.method" class="method-tag">{{ entry.method }}</span>
                   {{ displayLabel(entry) }}
                 </td>
+                <td class="hide-mobile cell-ip">{{ entry.ip_address || "—" }}</td>
                 <td class="hide-mobile cell-status">
                   <span v-if="entry.status_code" :class="entry.status_code >= 400 ? 'text-error' : ''">
                     {{ entry.status_code }}
@@ -230,9 +232,10 @@ function clearFilters() {
                   {{ entry.duration_ms != null ? entry.duration_ms + "ms" : "—" }}
                 </td>
               </tr>
-              <tr v-if="expandedId === entry.id && entry.details" class="detail-row">
-                <td colspan="6">
-                  <pre class="detail-json">{{ formatDetails(entry.details) }}</pre>
+              <tr v-if="expandedId === entry.id && (entry.details || entry.ip_address)" class="detail-row">
+                <td colspan="7">
+                  <div v-if="entry.ip_address" class="detail-ip">IP: {{ entry.ip_address }}</div>
+                  <pre v-if="entry.details" class="detail-json">{{ formatDetails(entry.details) }}</pre>
                 </td>
               </tr>
             </template>
@@ -406,11 +409,23 @@ function clearFilters() {
   font-family: monospace;
   font-size: 0.85rem;
 }
+.cell-ip {
+  font-family: monospace;
+  font-size: 0.8rem;
+  color: var(--color-text-muted);
+  white-space: nowrap;
+}
 .cell-duration {
   color: var(--color-text-muted);
   font-size: 0.8rem;
   white-space: nowrap;
 }
+.detail-ip {
+  font-family: monospace;
+  font-size: 0.8rem;
+  color: var(--color-text-muted);
+  margin-bottom: 0.4rem;
+}
 .text-error {
   color: var(--color-danger);
 }