feat: enhance README and TODO documentation, implement mobile menu functionality in Header component

- Updated README.md with project details, quick start instructions, and tech stack.
- Expanded TODO.md to reflect current project status and backlog items, including Linear ticket synchronization.
- Added mobile menu toggle functionality in Header component with corresponding tests for user interactions.
- Configured Next.js for Docker deployment and optimized build settings.

proto/Dockerfile

@@ -0,0 +1,48 @@
+# Multi-stage build for Next.js application
+# Stage 1: Build stage
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# Copy package files
+COPY package.json package-lock.json* ./
+
+# Install dependencies
+RUN npm ci --prefer-offline --no-audit
+
+# Copy source code
+COPY . .
+
+# Build the application
+RUN npm run build
+
+# Stage 2: Production runtime
+FROM node:20-alpine AS runner
+
+WORKDIR /app
+
+# Set production environment
+ENV NODE_ENV=production
+
+# Create non-root user for security
+RUN addgroup --system --gid 1001 nodejs
+RUN adduser --system --uid 1001 nextjs
+
+# Copy built application from builder stage
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+COPY --from=builder /app/public ./public
+
+# Change ownership to non-root user
+RUN chown -R nextjs:nodejs /app
+USER nextjs
+
+# Expose port
+EXPOSE 3000
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=5s --retries=5 \
+  CMD wget -qO- http://localhost:3000/api/health || exit 1
+
+# Start the application
+CMD ["node", "server.js"]