feat: Add a large collection of emoji and other frontend assets, including a sound file, and a backend package.json.

Backend/routes/upload.js

@@ -0,0 +1,41 @@
+const express = require('express');
+const multer = require('multer');
+const path = require('path');
+const fs = require('fs');
+
+const router = express.Router();
+
+// Ensure uploads directory exists
+const uploadDir = path.join(__dirname, '../uploads');
+if (!fs.existsSync(uploadDir)) {
+    fs.mkdirSync(uploadDir);
+}
+
+// Configure Multer Storage
+const storage = multer.diskStorage({
+    destination: (req, file, cb) => {
+        cb(null, uploadDir);
+    },
+    filename: (req, file, cb) => {
+        // Generate unique filename: timestamp-random.ext
+        const uniqueSuffix = Date.now() + '-' + Math.round(Math.random() * 1E9);
+        const ext = path.extname(file.originalname);
+        cb(null, uniqueSuffix + ext);
+    }
+});
+
+const upload = multer({ storage: storage });
+
+// POST /api/upload
+router.post('/', upload.single('file'), (req, res) => {
+    if (!req.file) {
+        return res.status(400).json({ error: 'No file uploaded' });
+    }
+
+    // Return the URL to access the file
+    // Assumes server serves 'uploads' folder at '/uploads'
+    const fileUrl = `/uploads/${req.file.filename}`;
+    res.json({ url: fileUrl, filename: req.file.filename });
+});
+
+module.exports = router;