improvement: docker infrastructure overhauled.

frontend/Dockerfile

@@ -1,72 +1,53 @@
-# Build stage
+# Build stage — produces `.next/standalone` (see next.config.ts output: standalone)
 FROM node:18-alpine AS builder
 
 WORKDIR /app
 
-# Copy package files
 COPY package*.json ./
 RUN npm ci
 
-# Copy source code
 COPY . .
 
-# Set build-time environment variables
+ARG NEXT_PUBLIC_API_URL
+ARG NEXT_PUBLIC_APP_URL
+ARG NEXT_PUBLIC_APP_NAME
+
 ENV NEXT_TELEMETRY_DISABLED=1
 ENV NODE_ENV=production
+ENV NEXT_PUBLIC_API_URL=${NEXT_PUBLIC_API_URL}
+ENV NEXT_PUBLIC_APP_URL=${NEXT_PUBLIC_APP_URL}
+ENV NEXT_PUBLIC_APP_NAME=${NEXT_PUBLIC_APP_NAME}
 
-# Build Next.js application
 RUN npm run build
 
-# Production stage
-FROM node:18-alpine
+# Production — minimal runtime using Next.js standalone bundle
+FROM node:18-alpine AS runner
+
+RUN apk add --no-cache dumb-init
 
 WORKDIR /app
 
-# Install dumb-init for proper signal handling
-RUN apk add --no-cache dumb-init
-
-# Create non-root user
 RUN addgroup -g 1001 -S nodejs && \
     adduser -S dyolink -u 1001
 
-# Copy package files
-COPY package*.json ./
+ENV NODE_ENV=production
+ENV PORT=3000
+ENV HOSTNAME=0.0.0.0
 
-# Install production dependencies only
-RUN npm ci --only=production && \
-    npm cache clean --force
-
-# Copy built application
-COPY --from=builder /app/.next ./.next
 COPY --from=builder /app/public ./public
-COPY --from=builder /app/next.config.js ./next.config.js
-COPY --from=builder /app/package.json ./package.json
+COPY --from=builder --chown=dyolink:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=dyolink:nodejs /app/.next/static ./.next/static
 
-# Create logs directory
-RUN mkdir -p /app/logs && \
-    chown -R dyolink:nodejs /app
+COPY docker-entrypoint.sh /usr/local/bin/docker-entrypoint.sh
+RUN chmod +x /usr/local/bin/docker-entrypoint.sh
 
-# Set ownership
-RUN chown -R dyolink:nodejs /app
-
-# Switch to non-root user
 USER dyolink
 
-# Health check
-HEALTHCHECK --interval=30s --timeout=5s --start-period=40s --retries=3 \
-  CMD node -e "require('http').get('http://localhost:3000', (r) => {if(r.statusCode!==200)throw new Error()})" || exit 1
-
 EXPOSE 3000
 
-ENV PORT=3000
-ENV HOSTNAME="0.0.0.0"
-ENV NODE_ENV=production
+HEALTHCHECK --interval=30s --timeout=5s --start-period=40s --retries=3 \
+  CMD node -e "require('http').get('http://127.0.0.1:3000/', (r) => {if(r.statusCode!==200)process.exit(1)})"
 
-# Copy entrypoint script
-COPY docker-entrypoint.sh /usr/local/bin/
-RUN chmod +x /usr/local/bin/docker-entrypoint.sh
-
-# Use dumb-init for signal handling
 ENTRYPOINT ["dumb-init", "--", "docker-entrypoint.sh"]
 
-CMD ["npm", "start"]
+CMD ["node", "server.js"]