frontend implementation

Dockerfile

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+# Multi-stage build for Gym Tracker application
+# Stage 1: Dependencies
+FROM node:20-alpine AS dependencies
+
+WORKDIR /app
+
+# Copy backend package files
+COPY backend/package*.json ./backend/
+
+# Install backend dependencies
+RUN cd backend && npm ci --only=production
+
+# Stage 2: Final image
+FROM node:20-alpine
+
+# Install nginx
+RUN apk add --no-cache nginx
+
+# Create app directory
+WORKDIR /app
+
+# Copy backend files and dependencies
+COPY --from=dependencies /app/backend/node_modules ./backend/node_modules
+COPY backend/package*.json ./backend/
+COPY backend/*.js ./backend/
+
+# Copy frontend files to nginx html directory
+COPY frontend/ /usr/share/nginx/html/
+
+# Copy nginx configuration
+COPY nginx/nginx.conf /etc/nginx/nginx.conf
+
+# Create data directory for SQLite database
+RUN mkdir -p /app/data && chmod 755 /app/data
+
+# Create nginx directories and set permissions
+RUN mkdir -p /var/log/nginx /var/lib/nginx /run/nginx && \
+    chown -R nginx:nginx /var/log/nginx /var/lib/nginx /run/nginx
+
+# Create startup script
+RUN echo '#!/bin/sh' > /app/start.sh && \
+    echo 'echo "Starting Gym Tracker application..."' >> /app/start.sh && \
+    echo '' >> /app/start.sh && \
+    echo '# Start nginx in background' >> /app/start.sh && \
+    echo 'echo "Starting nginx..."' >> /app/start.sh && \
+    echo 'nginx' >> /app/start.sh && \
+    echo '' >> /app/start.sh && \
+    echo '# Start backend server' >> /app/start.sh && \
+    echo 'echo "Starting backend server on port 3000..."' >> /app/start.sh && \
+    echo 'cd /app/backend' >> /app/start.sh && \
+    echo 'exec node server.js' >> /app/start.sh && \
+    chmod +x /app/start.sh
+
+# Expose ports
+EXPOSE 80 3000
+
+# Set environment variables
+ENV NODE_ENV=production
+ENV PORT=3000
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=10s --retries=3 \
+    CMD wget --quiet --tries=1 --spider http://localhost/health || exit 1
+
+# Run startup script
+CMD ["/app/start.sh"]