chore(infra): update build config and deployment scripts

Update Docker configurations, nginx setup, and shared design tokens. Refresh lockfile.

Dockerfile.frontend

@@ -0,0 +1,30 @@
+# Frontend Dockerfile - Multi-stage build
+FROM node:18-alpine AS builder
+
+WORKDIR /app
+
+# Install pnpm
+RUN npm install -g pnpm
+
+# Copy package files
+COPY package.json pnpm-lock.yaml ./
+RUN pnpm install --frozen-lockfile
+
+# Copy source and build
+COPY . .
+RUN pnpm run build
+
+# Production stage - nginx for static site
+FROM nginx:alpine AS production
+
+# Copy built files from builder stage
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+# Copy nginx configuration
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+# Expose port
+EXPOSE 4321
+
+# Start nginx
+CMD ["nginx", "-g", "daemon off;"]