Add help modal, changelog, map visits, Dockerfile, CI

- Help modal (? button or keyboard shortcut): how-to-play in Swedish,
  flavor text, full changelog sourced from src/data/version.ts
- src/data/version.ts: versioned changelog entries, in-universe Malmö voice
- Map zone clicks: each location on the Leaflet map is now clickable.
  Unlocked cult areas give resources + log entries. Locked locations show
  lore hints. 30s cooldown per location so it's a decision, not a spam button.
- Dockerfile + nginx.conf + docker-compose.yml (port 5684)
- Gitea CI workflow (identical to 2048 — derives image from repo path, needs
  TKNTKN secret, pushes :latest and :sha tags)
- README.md with mechanics summary and docker instructions

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -0,0 +1,40 @@
+# Djupet
+
+Lovecraftian idle cult management game set in Malmö, Sweden.
+
+You run a small cult in a basement in Rosengård. The goal is to complete the ritual before the investigators close in. The Turning Torso is involved. The ducks at Ribersborg know more than they let on.
+
+Inspired by Anders Fager, Kult, and Call of Cthulhu.
+
+**Play:** [djupet.games.goonk.se](https://djupet.games.goonk.se)
+
+## Stack
+
+Vanilla TypeScript + Vite. No framework. Leaflet for the map.
+
+## Dev
+
+```
+npm install
+npm run dev       # localhost:5681
+npm run typecheck
+npm run build
+```
+
+## Mechanics
+
+- **Andakt** — passive income, spend on upgrades
+- **Dread** — builds as the ritual deepens, unlocks areas and events
+- **Hemlighet** — your exposure level; reaches zero and you lose
+- **Kaos** — triggers chaotic events at 100, resets, repeat
+- **Ritual** — reach 100 to win; unlocked via the Manuscript
+
+Click locations on the Malmö map to visit them. There is a cooldown.
+
+## Docker
+
+```
+docker compose up -d
+```
+
+Serves on port `5684` by default. Override via `HOST_PORT` in `.env`.