Add /shouldibeworking endpoint, container timezone, and PowerShell CLI tracker

Ports work-time rules to the server for external polling, sets the
container TZ so schedule math matches Europe/Stockholm, and adds a
terminal-based progress tracker mirroring the web app.

Dockerfile

@@ -1,5 +1,8 @@
 FROM node:22-alpine
 
+RUN apk add --no-cache tzdata
+ENV TZ=Europe/Stockholm
+
 WORKDIR /app
 
 COPY package.json package-lock.json* ./