init：代码初始化

package.json

@@ -0,0 +1,31 @@
+{
+  "name": "steel_prices_service",
+  "version": "1.0.0",
+  "description": "钢材价格查询与分析服务平台",
+  "main": "src/server.js",
+  "scripts": {
+    "start": "node src/server.js",
+    "dev": "node src/server.js",
+    "db:init": "node scripts/init-db.js",
+    "db:import": "node scripts/import-data.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [
+    "steel",
+    "prices",
+    "api",
+    "express",
+    "mysql"
+  ],
+  "author": "",
+  "license": "MIT",
+  "dependencies": {
+    "cors": "^2.8.5",
+    "dotenv": "^17.2.3",
+    "express": "^5.2.1",
+    "morgan": "^1.10.1",
+    "mysql2": "^3.16.0",
+    "swagger-jsdoc": "^6.2.8",
+    "swagger-ui-express": "^5.0.1"
+  }
+}