feat: odometer in trips/overview, trips upload toggle, fix video count

- OBD odometer now logged to tracking rows on every GPS snapshot
- trips table: START_ODOMETER/END_ODOMETER columns (migration)
- build_trip_summaries: picks odometer from first/last tracking row
- list_trips: uses real OBD odo, falls back to cumulative distance
- overview stats: odometer_km (max seen from OBD), video_count fixed
- history page: Odometer column shows start→end km per trip
- app_upload: TRIPS_UPLOAD_SETTING_KEY, is_trips_upload_enabled()
- _upload_tracking_batch: skips when trips upload is off
- settings: separate 'Upload trips & GPS' toggle from dashcam toggle

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

static/js/history.js

@@ -156,6 +156,7 @@
                 <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)} → ${trip.odo_end_km.toFixed(0)} km</td>
                 <td class="text-end">
                     <button class="btn btn-sm btn-primary" type="button" data-trip-id="${trip.id}">
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