feat(bookings): show transport routes on map (#384, #587)

Adds from/to endpoints to flight/train/cruise/car reservations with
live map rendering. Flights use geodesic arcs and a curved duration +
distance badge; train/car/cruise render as straight or geodesic lines
with endpoint markers. Airports come from an embedded OurAirports
database (~3200 airports, offline-capable); train/cruise/car locations
via Nominatim. Per-trip connection toggle sits in the day plan
sidebar, persisted in localStorage. Clicking a map endpoint opens the
existing transport detail popup. New display setting toggles endpoint
labels on the map. Migration 105 adds the reservation_endpoints table
plus needs_review flag; existing flights are backfilled from their
IATA metadata on server startup.

server/src/app.ts

@@ -23,6 +23,7 @@ import tagsRoutes from './routes/tags';
 import categoriesRoutes from './routes/categories';
 import adminRoutes from './routes/admin';
 import mapsRoutes from './routes/maps';
+import airportsRoutes from './routes/airports';
 import filesRoutes from './routes/files';
 import reservationsRoutes from './routes/reservations';
 import dayNotesRoutes from './routes/dayNotes';
@@ -278,6 +279,7 @@ export function createApp(): express.Application {
   app.use('/api/integrations/memories', memoriesRoutes);
   app.use('/api/photos', photoRoutes);
   app.use('/api/maps', mapsRoutes);
+  app.use('/api/airports', airportsRoutes);
   app.use('/api/weather', weatherRoutes);
   app.use('/api/settings', settingsRoutes);
   app.use('/api/system-notices', systemNoticesRoutes);