docs: add README

README.md

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+# SR System — HQ Helpdesk & ITAM Portal
+
+SM/SI 파견 직원 통합 지원 및 IT 자산 관리 포털
+
+## Architecture
+
+```
+Cloudflare → NPM (SSL/443) → Frontend (Next.js 16, :3000)
+                                  └→ Backend (Spring Boot 3, :8080)
+                                        └→ PostgreSQL 15 (외부)
+```
+
+## Stack
+
+| Layer | Tech |
+|-------|------|
+| Frontend | Next.js 16, TypeScript, Tailwind CSS, Zustand |
+| Backend | Spring Boot 3.x, Java 17, Spring Data JPA, Spring Security |
+| Database | PostgreSQL 15 |
+| Infra | Docker, Nginx Proxy Manager, Cloudflare Tunnel |
+
+## Quick Start
+
+```bash
+cp .env.example .env
+# .env에 DB 비밀번호, JWT_SECRET 입력
+docker compose up -d --build
+```
+
+접속: `http://localhost:3000`
+
+### 로컬 개발
+
+```bash
+# backend
+cd backend && ./gradlew bootRun
+
+# frontend
+npm run dev
+```
+
+## Deploy
+
+```bash
+git pull
+docker compose up -d --build
+```
+
+NPM에서 Proxy Host 등록: `도메인 → http://서버IP:3000`
+
+## Structure
+
+```
+├── backend/           Spring Boot API
+├── src/               Next.js frontend
+│   ├── app/           Routes (App Router)
+│   ├── components/    UI components
+│   ├── services/      API client
+│   ├── stores/        Zustand stores
+│   └── types/         TypeScript types
+├── docker-compose.yml
+├── Dockerfile         Frontend
+└── .env.example
+```
+
+## Default Account
+
+| Role | ID | Password |
+|------|----|----------|
+| Admin | admin | admin123 |
+| Manager | manager | admin123 |
+| Employee | employee | admin123 |