Initial commit: AutonetSellCar platform with deployment system

- Frontend: Next.js 14 with TypeScript
- Backend: FastAPI with SQLAlchemy
- Agent: Carmodoo sync agent
- Deployment: Docker Compose based staging/production setup
- Scripts: Automated deployment with rollback support

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/lib/exchangeRateStore.ts

@@ -0,0 +1,114 @@
+/**
+ * Exchange Rate Store
+ * 한국수출입은행 API에서 가져온 환율 정보를 저장하고 관리
+ */
+import { create } from 'zustand';
+import { exchangeRateApi, ExchangeRateSimple } from './api';
+
+// 기본 환율 (API 실패 시 사용) - 2024년 12월 기준
+const DEFAULT_RATES: ExchangeRateSimple = {
+  USD: { rate: 1483, symbol: '$', name: '미국 달러' },
+  MNT: { rate: 0.43, symbol: '₮', name: '몽골 투그릭' },
+  RUB: { rate: 14.5, symbol: '₽', name: '러시아 루블' },
+  CNY: { rate: 203, symbol: '¥', name: '중국 위안' },
+  EUR: { rate: 1750, symbol: '€', name: '유로' },
+  JPY: { rate: 9.5, symbol: '¥', name: '일본 엔' },
+};
+
+interface ExchangeRateState {
+  rates: ExchangeRateSimple;
+  isLoading: boolean;
+  lastUpdated: Date | null;
+  error: string | null;
+  fetchRates: () => Promise<void>;
+  getKrwToUsd: () => number;  // KRW를 USD로 변환하는 비율 (1 KRW = X USD)
+  getUsdToMnt: () => number;  // USD를 MNT로 변환하는 비율 (1 USD = X MNT)
+  getUsdToRub: () => number;  // USD를 RUB로 변환하는 비율 (1 USD = X RUB)
+  convertKrwTo: (krwAmount: number, currency: string) => number;
+}
+
+export const useExchangeRateStore = create<ExchangeRateState>((set, get) => ({
+  rates: DEFAULT_RATES,
+  isLoading: false,
+  lastUpdated: null,
+  error: null,
+
+  fetchRates: async () => {
+    // 이미 로딩 중이면 스킵
+    if (get().isLoading) return;
+
+    // 30분 이내에 업데이트했으면 스킵
+    const lastUpdated = get().lastUpdated;
+    if (lastUpdated && Date.now() - lastUpdated.getTime() < 30 * 60 * 1000) {
+      return;
+    }
+
+    set({ isLoading: true, error: null });
+
+    try {
+      const rates = await exchangeRateApi.getSimpleRates();
+      set({
+        rates: { ...DEFAULT_RATES, ...rates },
+        isLoading: false,
+        lastUpdated: new Date(),
+      });
+    } catch (error) {
+      console.error('Failed to fetch exchange rates:', error);
+      set({
+        isLoading: false,
+        error: 'Failed to fetch exchange rates',
+      });
+      // 실패해도 기본값 사용
+    }
+  },
+
+  getKrwToUsd: () => {
+    const { rates } = get();
+    const usdRate = rates.USD?.rate || DEFAULT_RATES.USD.rate;
+    return 1 / usdRate; // 1 KRW = 1/1450 USD
+  },
+
+  getUsdToMnt: () => {
+    const { rates } = get();
+    const usdRate = rates.USD?.rate || DEFAULT_RATES.USD.rate;
+    const mntRate = rates.MNT?.rate || DEFAULT_RATES.MNT.rate;
+    // MNT rate is already in KRW per MNT
+    // So 1 USD = (USD_KRW / MNT_KRW) MNT
+    return usdRate / mntRate;
+  },
+
+  getUsdToRub: () => {
+    const { rates } = get();
+    const usdRate = rates.USD?.rate || DEFAULT_RATES.USD.rate;
+    const rubRate = rates.RUB?.rate || DEFAULT_RATES.RUB.rate;
+    return usdRate / rubRate;
+  },
+
+  convertKrwTo: (krwAmount: number, currency: string) => {
+    const { rates } = get();
+    const rate = rates[currency]?.rate || DEFAULT_RATES[currency]?.rate;
+    if (!rate) return 0;
+    return krwAmount / rate;
+  },
+}));
+
+// 환율 초기화 함수 (앱 시작 시 호출)
+export async function initExchangeRates() {
+  const store = useExchangeRateStore.getState();
+  await store.fetchRates();
+}
+
+// 환율 변환 헬퍼 함수들
+export function formatWithExchangeRate(
+  krwAmount: number,
+  currency: 'USD' | 'MNT' | 'RUB' | 'CNY' | 'EUR'
+): string {
+  const store = useExchangeRateStore.getState();
+  const converted = store.convertKrwTo(krwAmount, currency);
+  const symbol = store.rates[currency]?.symbol || DEFAULT_RATES[currency]?.symbol || '';
+
+  return `${symbol}${converted.toLocaleString('en-US', {
+    minimumFractionDigits: 0,
+    maximumFractionDigits: currency === 'USD' ? 0 : 0,
+  })}`;
+}