refactor: move timeline scheduler to isolated service

schedulers/client-timeline-calendar/Dockerfile

@@ -0,0 +1,12 @@
+FROM node:22-bookworm-slim
+
+WORKDIR /app/scheduler
+
+COPY package*.json ./
+RUN npm ci --omit=dev
+
+COPY run.mjs ./run.mjs
+
+ENV NODE_ENV=production
+
+CMD ["npm", "run", "start"]