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

backend/.gitignore

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+node_modules
+.env
+.env.example
+.env.local

backend/package.json

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+{
+    "name": "xeewy-server",
+    "version": "1.0.0",
+    "description": "Backend API for xeewy.be",
+    "main": "dist/index.js",
+    "scripts": {
+        "start": "node dist/index.js",
+        "dev": "nodemon src/index.ts",
+        "build": "tsc"
+    },
+    "keywords": [],
+    "author": "",
+    "license": "ISC",
+    "dependencies": {
+        "cors": "^2.8.5",
+        "dotenv": "^16.4.5",
+        "express": "^4.21.1",
+        "mysql2": "^3.11.3"
+    },
+    "devDependencies": {
+        "@types/cors": "^2.8.17",
+        "@types/express": "^5.0.0",
+        "@types/node": "^22.8.6",
+        "nodemon": "^3.1.7",
+        "ts-node": "^10.9.2",
+        "typescript": "^5.6.3"
+    }
+}

backend/src/config/db.ts

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+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

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+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}`);
+});

backend/tsconfig.json

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+{
+    "compilerOptions": {
+        "target": "es2016",
+        "module": "commonjs",
+        "outDir": "./dist",
+        "rootDir": "./src",
+        "strict": true,
+        "esModuleInterop": true,
+        "skipLibCheck": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "include": [
+        "src/**/*"
+    ],
+    "exclude": [
+        "node_modules"
+    ]
+}