feat(transport): add bus, taxi, bicycle, ferry and other transport types (#1105)

Closes #718. Adds five new transport reservation types alongside the
existing flight/train/car/cruise: bus, taxi, bicycle, ferry and a generic
'transport_other' catch-all. The new types are treated as first-class
transports everywhere — the transport modal, day plan, route calculation,
map overlays, file grouping and the PDF export — and are translated across
all 20 locales.

A dedicated 'transport_other' value is used for the catch-all so existing
'other' bookings are not reclassified as transport.

shared/src/i18n/ja/reservations.ts

@@ -54,6 +54,11 @@ const reservations: TranslationStrings = {
   'reservations.type.event': 'イベント',
   'reservations.type.tour': 'ツアー',
   'reservations.type.other': 'その他',
+  'reservations.type.bus': 'バス',
+  'reservations.type.ferry': 'フェリー',
+  'reservations.type.bicycle': '自転車',
+  'reservations.type.taxi': 'タクシー',
+  'reservations.type.transport_other': 'その他',
   'reservations.confirm.delete': '予約「{name}」を削除しますか？',
   'reservations.confirm.deleteTitle': '予約を削除しますか？',
   'reservations.confirm.deleteBody': '「{name}」は完全に削除されます。',