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/tests/test_exceptions.py

@@ -0,0 +1,45 @@
+import pytest
+from app.core.exceptions import (
+    TradeMateException,
+    NotFoundError,
+    UnauthorizedError,
+    ForbiddenError,
+    QuotaExceededError,
+    TierRestrictionError,
+)
+
+
+class TestExceptions:
+    def test_trade_mate_exception(self):
+        exc = TradeMateException(400, "Bad Request", "Details")
+        assert exc.code == 400
+        assert exc.message == "Bad Request"
+        assert exc.detail == "Details"
+
+    def test_not_found_error(self):
+        exc = NotFoundError("User")
+        assert exc.code == 404
+        assert "User" in exc.message
+        assert "not found" in exc.message
+
+    def test_unauthorized_error(self):
+        exc = UnauthorizedError()
+        assert exc.code == 401
+        assert exc.message == "Unauthorized"
+
+    def test_forbidden_error(self):
+        exc = ForbiddenError()
+        assert exc.code == 403
+        assert exc.message == "Forbidden"
+
+    def test_quota_exceeded_error(self):
+        exc = QuotaExceededError("translation")
+        assert exc.code == 429
+        assert "Quota exceeded" in exc.message
+        assert "translation" in exc.detail
+
+    def test_tier_restriction_error(self):
+        exc = TierRestrictionError("Advanced Feature", "Pro")
+        assert exc.code == 402
+        assert "Upgrade required" in exc.message
+        assert "Pro" in exc.detail