Update

backend/Dockerfile

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+# --- Build Stage ---
+FROM node:18-alpine AS builder
+
+WORKDIR /app
+
+# Copy package.json and yarn.lock first to leverage Docker cache
+COPY package.json yarn.lock ./
+RUN yarn install --frozen-lockfile
+
+# Copy the rest of the source code
+COPY . .
+
+# Compile TypeScript to JavaScript
+RUN yarn build
+
+# Prune development dependencies
+RUN yarn install --production --ignore-scripts --prefer-offline
+
+
+# --- Production Stage ---
+FROM node:18-alpine
+
+WORKDIR /app
+
+# Copy production dependencies and compiled code from the builder stage
+COPY --from=builder /app/node_modules ./node_modules
+COPY --from=builder /app/dist ./dist
+
+# Copy config.json from the project root relative to the Docker build context
+# IMPORTANT: When building, run `docker build -f backend/Dockerfile .` from the project root.
+COPY config.json ./
+
+# Expose the port the app runs on
+EXPOSE 3001
+
+# The command to run the application
+# You can override the port using -e PORT=... in `docker run`
+CMD [ "node", "dist/index.js" ]