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

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

docker-compose.yml

@@ -0,0 +1,54 @@
+version: '3.9'
+
+services:
+  postgres:
+    image: postgres:16-alpine
+    environment:
+      POSTGRES_DB: partymix
+      POSTGRES_USER: partymix
+      POSTGRES_PASSWORD: ${DB_PASSWORD}
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U partymix"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+    restart: unless-stopped
+
+  backend:
+    build:
+      context: ./apps/backend
+      dockerfile: Dockerfile
+    environment:
+      DB_HOST: postgres
+      DB_PORT: 5432
+      DB_USER: partymix
+      DB_PASSWORD: ${DB_PASSWORD}
+      DB_NAME: partymix
+      GIN_MODE: release
+      PORT: 8080
+      JWT_SECRET: ${JWT_SECRET}
+    ports:
+      - "8081:8080"
+    depends_on:
+      postgres:
+        condition: service_healthy
+    restart: unless-stopped
+
+  web:
+    build:
+      context: ./apps/web
+      dockerfile: Dockerfile
+      args:
+        NEXT_PUBLIC_API_URL: ${NEXT_PUBLIC_API_URL:-http://localhost:8080}
+    environment:
+      NEXT_PUBLIC_API_URL: ${NEXT_PUBLIC_API_URL:-http://localhost:8080}
+    ports:
+      - "3001:3000"
+    depends_on:
+      - backend
+    restart: unless-stopped
+
+volumes:
+  postgres_data: