Implement multi-stage Docker build for clean production image

- Build stage: Has scripts/ for version generation, all dependencies
- Production stage: Only production deps, built artifacts, server.js
- Eliminates build scripts and dev dependencies from final image
- Maintains proper version.js generation during build process

Dockerfile

@@ -1,5 +1,5 @@
-# Use Node 24 LTS as base image
-FROM node:24-alpine
+# Build stage
+FROM node:24-alpine AS builder
 
 # Set working directory
 WORKDIR /app
@@ -10,17 +10,31 @@ COPY package*.json ./
 # Install dependencies (production + dev for build)
 RUN npm ci
 
-# Copy source code
+# Copy source code and build scripts
 COPY src/ ./src/
 COPY public/ ./public/
+COPY scripts/ ./scripts/
 COPY server.js ./server.js
 
 # Build the application
 RUN npm run build
 
-# Remove dev dependencies to reduce image size
+# Production stage
+FROM node:24-alpine AS production
+
+# Set working directory
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install only production dependencies
 RUN npm ci --only=production && npm cache clean --force
 
+# Copy built application and server from build stage
+COPY --from=builder /app/build ./build
+COPY --from=builder /app/server.js ./server.js
+
 # Expose port 3000
 EXPOSE 3000