Fix remote portal trip list

- /api/trips now returns {trips:[...]} to match what history.js expects (result.trips)
- odo_start_km null guard in history.js (server trips have no odometer data)
- require_login returns 401 JSON for /api/* paths instead of HTML redirect

Co-authored-by: Copilot <[email protected]>

static/js/history.js

@@ -189,7 +189,7 @@
                 <td>${formatDistance(trip.distance_km)}</td>
                 <td>${formatDuration(trip.duration_seconds)}</td>
                 <td>${formatSpeed(trip.max_speed_kmh)}</td>
-                <td class="text-muted small">${trip.odo_start_km.toFixed(0)} → ${trip.odo_end_km.toFixed(0)} km</td>
+                <td class="text-muted small">${trip.odo_start_km != null ? trip.odo_start_km.toFixed(0) + ' → ' + trip.odo_end_km.toFixed(0) + ' km' : '—'}</td>
                 <td class="text-end d-none d-sm-table-cell">
                     <button class="btn btn-sm btn-primary" type="button" data-trip-id="${trip.id}">
                         Replay