Initial commit: TradeMate 外贸小助手 MVP

项目结构:
- backend/     Python FastAPI 后端
- uni-app/     uni-app跨端前端
- docs/        设计文档
- docker-compose.yml  Docker编排
- nginx/scripts/systemd 运维配置

已完成功能:
- 用户认证 (JWT)
- 智能翻译 + 回复建议
- 营销素材生成
- 客户管理 + 沉默检测
- 报价单管理
- 产品库管理
- 汇率换算
- 推送通知 (uni-push)
- WhatsApp Webhook框架
- Celery定时任务

backend/app/api/v1/exchange.py

@@ -0,0 +1,54 @@
+from fastapi import APIRouter
+from pydantic import BaseModel
+
+router = APIRouter()
+
+
+class ExchangeRateResponse(BaseModel):
+    from_currency: str
+    to_currency: str
+    rate: float
+    updated_at: str
+
+
+EXCHANGE_RATES = {
+    ("USD", "CNY"): 7.24,
+    ("EUR", "CNY"): 7.85,
+    ("GBP", "CNY"): 9.15,
+    ("CNY", "USD"): 0.138,
+    ("USD", "EUR"): 0.92,
+    ("EUR", "USD"): 1.09,
+    ("GBP", "USD"): 1.27,
+    ("USD", "GBP"): 0.79,
+}
+
+
+@router.get("/convert")
+async def convert_currency(
+    from_currency: str = "USD",
+    to_currency: str = "CNY",
+    amount: float = 1.0,
+):
+    rate = EXCHANGE_RATES.get((from_currency, to_currency), 1.0)
+    return {
+        "from_currency": from_currency,
+        "to_currency": to_currency,
+        "amount": amount,
+        "converted": round(amount * rate, 2),
+        "rate": rate,
+        "updated_at": "2026-05-08T00:00:00Z",
+    }
+
+
+@router.get("/rates")
+async def get_rates(base: str = "USD"):
+    rates = {}
+    for (from_curr, to_curr), rate in EXCHANGE_RATES.items():
+        if from_curr == base:
+            rates[to_curr] = rate
+
+    return {
+        "base": base,
+        "rates": rates,
+        "updated_at": "2026-05-08T00:00:00Z",
+    }