feat(01-01): Next.js 15 project with Docker Compose dev environment

- Next.js 15 with App Router, TypeScript, Tailwind CSS (v4), ESLint
- docker-compose.yml with PostgreSQL 16, Redis 7, and app service
- Dockerfile (Node 20 alpine) for containerized development
- .env and .env.example with DATABASE_URL, DATABASE_URL_LOCAL, REDIS_URL
- src/app/page.tsx updated to render NetForge heading
- All three services start healthy with docker compose up -d

docker-compose.yml

@@ -0,0 +1,59 @@
+services:
+  db:
+    image: postgres:16-alpine
+    container_name: netforge_db
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: netforge
+      POSTGRES_PASSWORD: netforge_dev
+      POSTGRES_DB: netforge_dev
+    ports:
+      - "5432:5432"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U netforge -d netforge_dev"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+  redis:
+    image: redis:7-alpine
+    container_name: netforge_redis
+    restart: unless-stopped
+    ports:
+      - "6379:6379"
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+  app:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: netforge_app
+    restart: unless-stopped
+    ports:
+      - "3000:3000"
+    depends_on:
+      db:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    volumes:
+      - .:/app
+      - /app/node_modules
+      - /app/.next
+    environment:
+      - DATABASE_URL=postgresql://netforge:netforge_dev@db:5432/netforge_dev
+      - REDIS_URL=redis://redis:6379
+      - NEXTAUTH_SECRET=dev-secret-change-in-production
+      - NEXTAUTH_URL=http://localhost:3000
+      - NODE_ENV=development
+    env_file:
+      - .env
+
+volumes:
+  postgres_data: