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/zh-TW/reservations.ts

@@ -53,6 +53,11 @@ const reservations: TranslationStrings = {
   'reservations.type.event': '活動',
   'reservations.type.tour': '旅遊團',
   'reservations.type.other': '其他',
+  'reservations.type.bus': '公車',
+  'reservations.type.ferry': '渡輪',
+  'reservations.type.bicycle': '自行車',
+  'reservations.type.taxi': '計程車',
+  'reservations.type.transport_other': '其他',
   'reservations.confirm.delete': '確定要刪除預訂「{name}」嗎？',
   'reservations.confirm.deleteTitle': '刪除預訂？',
   'reservations.confirm.deleteBody': '"{name}" 將被永久刪除。',