feat: implement Sleepy sleep diary

Dockerfile

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+FROM node:22-alpine AS builder
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci
+COPY . .
+RUN npm run build
+
+FROM node:22-alpine
+WORKDIR /app
+ENV NODE_ENV=production
+ENV PORT=3000
+COPY --from=builder /app/public ./public
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+RUN mkdir -p /data
+VOLUME ["/data"]
+EXPOSE 3000
+CMD ["node", "server.js"]