feat: Initialize backend with Express and MySQL, and restructure frontend with new routing and language support.

backend/src/config/db.ts

@@ -0,0 +1,17 @@
+import mysql from 'mysql2/promise';
+import dotenv from 'dotenv';
+
+dotenv.config();
+
+const pool = mysql.createPool({
+    host: process.env.DB_HOST,
+    user: process.env.DB_USER,
+    password: process.env.DB_PASSWORD,
+    database: process.env.DB_NAME,
+    port: Number(process.env.DB_PORT) || 3306,
+    waitForConnections: true,
+    connectionLimit: 10,
+    queueLimit: 0
+});
+
+export default pool;

backend/src/index.ts

@@ -0,0 +1,32 @@
+import express from 'express';
+import cors from 'cors';
+import dotenv from 'dotenv';
+import pool from './config/db';
+
+dotenv.config();
+
+const app = express();
+const port = process.env.PORT || 3000;
+
+app.use(cors());
+app.use(express.json());
+
+// Basic health check
+app.get('/api/health', (req, res) => {
+    res.json({ status: 'ok', timestamp: new Date() });
+});
+
+// Database connection test
+app.get('/api/test-db', async (req, res) => {
+    try {
+        const [rows] = await pool.query('SELECT 1 + 1 AS solution');
+        res.json({ status: 'connected', result: rows });
+    } catch (error: any) {
+        console.error('Database connection error:', error);
+        res.status(500).json({ status: 'error', message: error.message });
+    }
+});
+
+app.listen(port, () => {
+    console.log(`Server running on port ${port}`);
+});