feat: add Google Maps list import

Import places from shared Google Maps lists via URL.
Button in places sidebar next to GPX import opens a modal
where users can paste a shared list link. Server fetches
list data from Google Maps and creates places with name,
coordinates and notes. i18n keys added for all 12 languages.

Closes #205

client/src/api/client.ts

@@ -107,6 +107,8 @@ export const placesApi = {
     const fd = new FormData(); fd.append('file', file)
     return apiClient.post(`/trips/${tripId}/places/import/gpx`, fd, { headers: { 'Content-Type': 'multipart/form-data' } }).then(r => r.data)
   },
+  importGoogleList: (tripId: number | string, url: string) =>
+    apiClient.post(`/trips/${tripId}/places/import/google-list`, { url }).then(r => r.data),
 }
 
 export const assignmentsApi = {