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

Dockerfile

@@ -0,0 +1,14 @@
+FROM node:20-alpine
+
+WORKDIR /app
+
+# Install dependencies first (layer cache optimization)
+COPY package.json package-lock.json ./
+RUN npm ci
+
+# Copy source code
+COPY . .
+
+EXPOSE 3000
+
+CMD ["npm", "run", "dev"]