fix: upgrade to Node 22 — obsidian-headless requires navigator, WebSocket, fetch globals only available in Node 22+

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:20-slim
+FROM node:22-slim
 
 # Install system dependencies
 RUN apt-get update && apt-get install -y \

docker-compose.yml

@@ -15,5 +15,3 @@ services:
       - .env
     environment:
       - TZ=UTC
-      # Enable the experimental WebSocket global required by obsidian-headless
-      - NODE_OPTIONS=--experimental-websocket