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/Collab-Polls.md

@@ -0,0 +1,61 @@
+# Collab Polls
+
+Create group polls to make decisions collaboratively — where to eat, which hotel, what to do on a free day.
+
+<!-- TODO: screenshot: poll with options and vote counts -->
+
+![Collab Polls](assets/Collab.png)
+
+## Where to find it
+
+Open the trip planner → **Collab** tab → **Polls** section. The Collab addon must be enabled and the Polls sub-feature must be turned on. See [Real-Time-Collaboration](Real-Time-Collaboration).
+
+## Creating a poll
+
+Users with `collab_edit` permission can click **+ New** in the Polls header. A modal opens with the following fields:
+
+| Field | Required | Notes |
+|-------|----------|-------|
+| Question | Yes | The poll prompt |
+| Options | Yes | At least 2 options required; add more with **+ Add option** |
+| Multiple choice | No | Toggle on to allow voters to select more than one option |
+
+Click **Create** to save and broadcast the poll to all connected members.
+
+## Voting
+
+Click an option button to vote. A filled circle and blue highlight indicate your selection. For **multiple-choice** polls, you can click additional options to select more than one; clicking an already-selected option removes your vote for that option. For **single-choice** polls, clicking a different option moves your vote to the new selection.
+
+Percentage bars and voter avatars are only visible **after you have voted** or once the poll is closed or expired.
+
+## Results
+
+Each option shows:
+
+- A **percentage fill bar** that expands proportionally to the votes received
+- Up to **3 voter avatar chips** stacked next to the option
+- The **percentage** of total votes in the right margin
+
+The option with the most votes is highlighted when the poll is closed or expired.
+
+## Deadline
+
+Polls may have an optional deadline set via the API. When a deadline is present, a live countdown badge appears on the poll card, updating every **30 seconds**. The badge shows the remaining time in days/hours/minutes format.
+
+When the deadline passes, the poll is automatically treated as closed: voting is disabled and results are displayed to everyone.
+
+## Closing a poll manually
+
+Users with `collab_edit` permission can click the lock icon on an open poll to close it immediately. Once closed, voting is permanently disabled.
+
+## Deleting a poll
+
+Users with `collab_edit` permission can delete a poll using the trash icon. Deletion is permanent and removes the poll for all members.
+
+## Active and closed sections
+
+Open polls appear at the top of the list. Closed or expired polls move to a **Closed** section below the active polls.
+
+## Related pages
+
+[Real-Time-Collaboration](Real-Time-Collaboration) · [Collab-Chat](Collab-Chat) · [Collab-Notes](Collab-Notes)