feat: add backend server

server/database.js

@@ -0,0 +1,24 @@
+import mongoose from 'mongoose'
+import User from './model/user.js'
+
+const connectDB = async () => {
+    try {
+        const conn = await mongoose.connect(process.env.MONGO_URI)
+        console.log(`MongoDB Connected: ${conn.connection.host}`)
+        // 检查是否存在管理员用户，如果不存在则创建一个默认管理员
+        const adminUser = await User.findOne({ username: process.env.ADMIN_USERNAME })
+        if (!adminUser) {
+            await User.create({
+                username: process.env.ADMIN_USERNAME,
+                nickname: '管理员',
+                password: process.env.ADMIN_PASSWORD,
+                role: 'admin',
+            })
+        }
+    } catch (error) {
+        console.error('Error connecting to MongoDB:', error)
+        process.exit(1)
+    }
+}
+
+export default connectDB