Refactor code structure for improved readability and maintainability

docker/Dockerfile

@@ -1,15 +1,16 @@
-FROM node:20-alpine AS builder
+# syntax=docker/dockerfile:1.7
+FROM node:20-bookworm-slim AS builder
 
 WORKDIR /app
 
 COPY package.json package-lock.json ./
-RUN npm ci
+RUN --mount=type=cache,target=/root/.npm npm ci --no-audit --no-fund
 
 COPY . .
 RUN npm run build
-RUN npm prune --omit=dev
+RUN --mount=type=cache,target=/root/.npm npm prune --omit=dev --no-audit --no-fund
 
-FROM node:20-alpine
+FROM node:20-bookworm-slim
 
 WORKDIR /app