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/settings.js

@@ -13,6 +13,7 @@ const lastPhoneAddressLink = document.getElementById('last-phone-address-link');
 let initialUplinkStatusLoaded = false;
 
 const fields = {
+    tripsUpload: document.getElementById('trips-upload-enabled'),
     dashcamUpload: document.getElementById('dashcam-upload-enabled'),
     retention: document.getElementById('retention-days'),
     videoConvert: document.getElementById('video-convert-enabled'),
@@ -79,6 +80,7 @@ function applyErrors(errors) {
 
 function populate(settings) {
     const thresholds = settings.alert_thresholds;
+    fields.tripsUpload.checked = settings.trips_upload_enabled;
     fields.dashcamUpload.checked = settings.dashcam_upload_enabled;
     fields.retention.value = settings.local_video_retention_days;
     fields.videoConvert.checked = settings.video_convert_enabled;
@@ -105,6 +107,7 @@ function populate(settings) {
 
 function payload() {
     return {
+        trips_upload_enabled: fields.tripsUpload.checked,
         dashcam_upload_enabled: fields.dashcamUpload.checked,
         local_video_retention_days: Number(fields.retention.value),
         video_convert_enabled: fields.videoConvert.checked,