feat: convert App Config detail to slide-in DetailPanel

Replaces the separate AppConfigDetailPage route with a 640px-wide
DetailPanel that slides in when clicking a row on the App Config
overview table. All editing functionality (settings, traces & taps,
route recording) is preserved inside the panel.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/pages/Admin/AppConfigPage.module.css

@@ -1 +1,97 @@
-/* No custom styles needed — DataTable with badges handles everything */
+.widePanel {
+  width: 640px !important;
+}
+
+.panelSection {
+  margin-bottom: 16px;
+}
+
+.panelSectionHeader {
+  font-size: 11px;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+  color: var(--text-muted);
+  margin-bottom: 8px;
+}
+
+.settingsGrid {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 16px;
+}
+
+.field {
+  display: flex;
+  flex-direction: column;
+  gap: 3px;
+}
+
+.fieldLabel {
+  font-size: 10px;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+  color: var(--text-muted);
+}
+
+.select {
+  padding: 4px 8px;
+  border: 1px solid var(--border-subtle);
+  border-radius: var(--radius-sm);
+  background: var(--bg-body);
+  color: var(--text-primary);
+  font-size: 11px;
+  font-family: var(--font-mono);
+  outline: none;
+}
+
+.select:focus {
+  border-color: var(--amber);
+}
+
+.toggleRow {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  font-size: 11px;
+  color: var(--text-secondary);
+}
+
+.sectionSummary {
+  font-size: 11px;
+  color: var(--text-muted);
+  margin-bottom: 8px;
+  display: block;
+}
+
+.tapBadges {
+  display: flex;
+  gap: 4px;
+  flex-wrap: wrap;
+}
+
+.hint {
+  color: var(--text-faint);
+  font-size: 11px;
+}
+
+.removeBtn {
+  background: none;
+  border: none;
+  color: var(--text-muted);
+  cursor: pointer;
+  font-size: 16px;
+  padding: 0 4px;
+  line-height: 1;
+}
+
+.removeBtn:hover {
+  color: var(--error);
+}
+
+.panelMeta {
+  font-size: 11px;
+  color: var(--text-muted);
+  margin-bottom: 12px;
+}