build: 更新项目结构和配置

- 移除 .gitignore 中的多个文件和目录
- 删除 README.md 文件
- 移除 app.vue 文件
- 删除 nuxt.config.ts 文件

server/src/utils/db.util.ts

@@ -1,8 +1,8 @@
 import mysql from 'mysql';
-import { dbConfig } from '../config/db.config';
+import { cdkDbConfig } from '../config/db.config';
 
 // 创建连接池
-const pool = mysql.createPool(dbConfig);
+const pool = mysql.createPool(cdkDbConfig);
 
 // 获取数据库连接
 export const getConnection = (): Promise<mysql.PoolConnection> => {
@@ -18,8 +18,10 @@ export const getConnection = (): Promise<mysql.PoolConnection> => {
 };
 
 // 执行查询
-export const query = async (sql: string, values?: any[]): Promise<any> => {
-    const connection = await getConnection();
+export const query = async (sql: string, values?: any[], connection?: mysql.PoolConnection): Promise<any> => {
+    if (!connection) {
+        connection = await getConnection()
+    }
     return new Promise((resolve, reject) => {
         connection.query(sql, values, (err, results) => {
             connection.release(); // 释放连接