🐳 Update Dockerfile to optimize image build process and dependencies

code/websites/pokedex.online/server/Dockerfile

@@ -0,0 +1,31 @@
+# Backend Production Dockerfile
+FROM node:20-alpine
+
+# Set working directory
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install production dependencies only
+RUN npm ci --only=production
+
+# Copy application code
+COPY . .
+
+# Create directories for data and logs
+RUN mkdir -p /app/data /app/logs
+
+# Set production environment
+ENV NODE_ENV=production
+ENV PORT=3000
+
+# Expose the server port
+EXPOSE 3000
+
+# Health check endpoint (will be added to server)
+HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
+  CMD node -e "require('http').get('http://localhost:3000/health', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"
+
+# Run the application
+CMD ["node", "oauth-proxy.js"]