Initial commit: party-mix-app with prefetch cache, audio preload optimizations

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/web/Dockerfile

@@ -0,0 +1,23 @@
+FROM node:22-alpine AS deps
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci
+
+FROM node:22-alpine AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+ARG NEXT_PUBLIC_API_URL=http://localhost:8080
+ENV NEXT_PUBLIC_API_URL=$NEXT_PUBLIC_API_URL
+RUN npm run build
+
+FROM node:22-alpine AS runner
+WORKDIR /app
+ENV NODE_ENV=production
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+COPY --from=builder /app/public ./public
+EXPOSE 3000
+ENV PORT=3000
+ENV HOSTNAME="0.0.0.0"
+CMD ["node", "server.js"]