docs: add full wiki with 74 pages, assets, and CI workflow

Adds the complete TREK documentation wiki covering installation,
trip planning, admin panel, MCP/AI integration, addons, and operations.

Also fixes encrypt-at-rest gaps: mapbox_access_token, Synology
credentials, per-user webhook/ntfy tokens, and photo passphrases
are now rotated by migrate-encryption.ts and stored encrypted via
settingsService.

wiki/PDF-Export.md

@@ -0,0 +1,98 @@
+# PDF Export
+
+TREK can generate two kinds of PDFs from your trip data: a structured **Trip Plan PDF** and a photo-book-style **Journey Book PDF**. Both render as HTML in a sandboxed iframe and open the browser's native print/save dialog — no server-side processing is involved.
+
+<!-- TODO: screenshot: export options dialog or PDF preview modal -->
+
+![PDF Export](assets/PDFTrip.png)
+
+---
+
+## Trip Plan PDF
+
+### How to generate
+
+Open the Day Plan sidebar in the trip planner. Click the **PDF** button in the toolbar at the top of the sidebar. A preview modal opens immediately; click **Save as PDF** to open your browser's print dialog and save the file.
+
+### Cover page
+
+- Blurred cover image as background (if the trip has one), with the same image in a circular badge
+- Trip title and description
+- Date range (first day to last day)
+- Stat tiles:
+  - **Days** — total number of days in the trip
+  - **Places** — total places in your trip's place list
+  - **Planned** — number of unique places assigned to at least one day
+  - **Estimated cost** — sum of all assigned place prices in EUR (hidden if zero)
+
+### Per-day pages
+
+Each day starts on a new page with a dark header bar showing the day number, day title, date, and the day's estimated cost.
+
+Below the header:
+
+- **Accommodation block** (if an accommodation covers that day): action label (Check-in on the first day, Check-out on the last day, or Accommodation for intermediate days), time, place name, address, notes, and confirmation code (only shown on the check-in day)
+- **Timeline items** sorted by their order in the day plan:
+  - **Places** — thumbnail (or a colored category icon if no image is available), numbered badge, name, category label, address, description, time, price, and notes
+  - **Notes** — icon, text, and optional time
+  - **Reservations** — type icon, title, time, type-specific metadata (e.g. airline + flight number + route for flights; train number + platform + seat for trains; party size for restaurants; venue for events; operator for tours), location, and confirmation code
+
+### Footer
+
+Every printed page carries a small "made with TREK" logo at the bottom.
+
+### Font
+
+Poppins, loaded from Google Fonts at render time.
+
+---
+
+## Journey Book PDF
+
+### How to generate
+
+Open a Journey entry in the Travel Journal. Click the **download icon** button in the journal's header area. A preview modal opens; click **Save as PDF** to print.
+
+![Journey Book PDF Preview](assets/PDFJourney.png)
+
+### Format
+
+A4 landscape (`@page { size: A4 landscape; margin: 0 }`). Font: Inter, loaded from Google Fonts.
+
+### Cover page
+
+- Hero image (journey cover image, or the first entry photo if none is set)
+- Journey title and optional subtitle
+- Stat tiles: Days, Entries, Photos
+
+### Entry pages
+
+One page per journal entry, in chronological order. The first entry of each date carries a day header (day number and full date) above the content.
+
+Photo layout adapts to the number of photos on the entry:
+
+| Photos | Layout |
+|--------|--------|
+| 1 | Single image, full width |
+| 2 | Two images side by side |
+| 3 or more | Large hero image on the left, two stacked images on the right |
+
+Below the photos: entry time and location, entry title, journal text (rendered from Markdown), and pros/cons verdict cards if present.
+
+### Closing page
+
+A dark "The End" card.
+
+---
+
+## How rendering works
+
+Both PDFs use the same mechanism: the HTML document is written into a sandboxed `<iframe>` via `srcdoc`, and `iframe.contentWindow.print()` opens the browser's print dialog. There is no server-side PDF generation. The file is saved through the browser's built-in "Save as PDF" print destination.
+
+---
+
+## See also
+
+- [Day-Plans-and-Notes](Day-Plans-and-Notes)
+- [Journey-Journal](Journey-Journal)
+- [Trip-Planner-Overview](Trip-Planner-Overview)