feat(mcp): align MCP surface with current app state

- Add Journey addon tools (list, get, entries, contributors, suggestions,
  available trips, create/update/delete journey and entries, reorder,
  contributors CRUD, preferences, share link management)
- Add Journey resources (trek://journeys and sub-resources)
- Split transport (flight/train/car/cruise) into dedicated tools with
  endpoints[] and needs_review support; narrow reservation types to
  non-transport only
- Add airport lookup tools (search_airports, get_airport) under geo:read
- Add import_places_from_url and bulk_delete_places to places tools
- Add journey:read/write/share OAuth scopes (27 total) with translations
  across all 15 locales
- Default end_day to start_day when creating a transport (MCP + UI)
- Fix MCP.md drift: addon gates, removed files resource, corrected
  get_trip_summary description, todos under Packing addon

server/src/mcp/index.ts

@@ -38,6 +38,7 @@ You are connected to TREK, a travel planning application. Below is a compact ref
 - **Collab note / poll / message** — shared notes, decision polls, and chat messages for group trips.
 - **Atlas** — global travel journal: bucket list, visited countries and regions.
 - **Vacay** — vacation-day planner that tracks leave across team members and years.
+- **Journey** — cross-trip travel narrative with dated entries, contributors, and share links. Requires the Journey addon.
 
 ## Key workflows
 
@@ -75,6 +76,7 @@ The following features are optional and may not be available on every TREK insta
 - **Collab** — shared notes, polls, and chat messages for group trips.
 - **Atlas** — bucket list and visited-country/region tracking.
 - **Vacay** — team vacation-day planner with public holiday integration.
+- **Journey** — cross-trip travel narrative with entries, contributors, and share links.
 
 ## Behavioral rules