feat(reservations): native booking-confirmation import via KDE KItinerary (#1102)

* feat(reservations): native booking-confirmation import via KDE KItinerary

Adds a two-step preview → confirm flow for importing booking emails,
PDFs, PKPass and HTML confirmations. The server invokes the KDE
kitinerary-extractor binary, maps JSON-LD schema.org output to TREK
reservation shapes, and persists via the existing createReservation
pipeline (accommodations, budget, places, WebSocket broadcasts).

- NestJS BookingImportModule: preview + confirm endpoints under
  /api/trips/:tripId/reservations/import/booking{,/confirm}
- KitineraryExtractorService: spawns the binary, filters stderr noise,
  handles QDateTime (@value) timezone-aware datetimes
- kitinerary-mapper: FlightReservation, TrainReservation, BusReservation,
  BoatReservation, LodgingReservation, FoodEstablishmentReservation,
  RentalCarReservation, EventReservation → typed preview items
- BookingImportService: auto-creates place rows; geocodes venues without
  coordinates via Nominatim (name+address → address → name fallback);
  resolves day IDs for accommodation linking
- BookingImportModal: drag-and-drop multi-file upload, preview cards
  with type icons, per-item exclude toggle, confirm step
- Shared Zod contracts: BookingImportPreviewItem, PreviewResponse,
  ConfirmRequest, ConfirmResponse — consumed by controller, service,
  API client and modal
- Dockerfile: node:24-trixie-slim runtime; amd64 downloads KDE static
  binary + locales; arm64 installs libkitinerary-bin + symlinks to
  fixed path; ENV KITINERARY_EXTRACTOR_PATH set for both arches
- /api/health/features exposes { bookingImport: boolean } so the UI
  hides the Import button when the binary is absent
- i18n keys (English), wiki docs, API.md, README one-liner

* i18n: add booking import translations for all 19 non-English locales

Adds 17 reservations.import.* keys and undo.importBooking to ar, br, cs,
de, es, fr, gr, hu, id, it, ja, ko, nl, pl, ru, tr, uk, zh, zh-TW.

* chore: enforce i18n parity

* docs(wiki): add KItinerary local setup instructions to dev environment guide

wiki/Reservations-and-Bookings.md

@@ -76,6 +76,47 @@ Click **Add** (or the + button) in the Reservations panel. Fill in the form:
 
 <!-- TODO: screenshot: Create Reservation modal -->
 
+## Import from booking confirmation
+
+TREK can parse booking confirmation emails, PDFs, and pass files and create reservations automatically using [KDE Itinerary](https://apps.kde.org/itinerary/).
+
+### Supported formats
+
+| Format | Extension |
+|--------|-----------|
+| Booking confirmation email | `.eml` |
+| PDF ticket or confirmation | `.pdf` |
+| Apple Wallet pass | `.pkpass` |
+| HTML confirmation page | `.html`, `.htm` |
+| Plain-text email | `.txt` |
+
+Up to 5 files, 10 MB each, per import.
+
+### How to import
+
+1. Open the **Reservations** tab.
+2. Click the **Import** (download) button in the toolbar — the button is only shown when the extractor is available on your server.
+3. Drag and drop your files onto the upload area, or click to browse.
+4. TREK parses each file and shows a **preview list** of the detected reservations with type, title, dates, endpoints, and confirmation number.
+5. Deselect any items you do not want to import by clicking the × on their card.
+6. Click **Confirm** to create the selected reservations.
+
+All created reservations appear immediately in the panel and are broadcast to all connected trip members in real time.
+
+### What gets created automatically
+
+- **Hotels** — a reservation *and* a linked accommodation row in the day plan (check-in/check-out dates are read from the confirmation).
+- **Hotels / Restaurants / Events** — the venue is auto-created as a place with coordinates when the extractor returns location data.
+- **All types** — a budget entry is created if the Budget addon is enabled and a price is present.
+
+### When the button is not visible
+
+The Import button is hidden when the `kitinerary-extractor` binary is not available. The binary ships inside the official TREK Docker image. If you run TREK from source, install the `libkitinerary-bin` package (Debian trixie / Ubuntu 25.04+) or set `KITINERARY_EXTRACTOR_PATH` to the binary's full path. See [Environment-Variables](Environment-Variables).
+
+### Needs review flag
+
+Items that the extractor could only partially parse are flagged **Needs review** — an amber badge on the card. Review these reservations after import and fill in any missing fields manually.
+
 ## Editing and deleting
 
 Each card has a pencil icon to open the edit form and a trash icon to delete. Deleting requires confirmation in a dialog before the record is removed.