chore: happy 出口通初始提交（前端 React + 后端 Express，采购管理已原生化）

backend/package.json

@@ -0,0 +1,22 @@
+{
+  "name": "trade-management-backend",
+  "version": "1.0.0",
+  "description": "外贸供应链管理系统 - 后端",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js",
+    "dev": "nodemon server.js"
+  },
+  "keywords": ["trade", "crm", "supply-chain"],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "better-sqlite3-multiple-ciphers": "^13.0.3",
+    "cors": "^2.8.5",
+    "express": "^4.18.2",
+    "multer": "^1.4.5-lts.1"
+  },
+  "devDependencies": {
+    "nodemon": "^3.0.1"
+  }
+}