Add HTTPS server (self-signed fallback), update frontend messages, and README

server.js

@@ -57,6 +57,30 @@ const m2m100LangMap = {
 const app = express();
 const PORT = process.env.PORT || 3000;
 
+// HTTPS setup (optional). Serve HTTPS on 3443 using provided certs or generate a self-signed cert.
+const https = require('https');
+const fs = require('fs');
+const selfsigned = require('selfsigned');
+const SSL_PORT = process.env.SSL_PORT || 3443;
+
+function loadSslOptions() {
+    const keyPath = process.env.SSL_KEY_PATH;
+    const certPath = process.env.SSL_CERT_PATH;
+
+    if (keyPath && certPath && fs.existsSync(keyPath) && fs.existsSync(certPath)) {
+        return {
+            key: fs.readFileSync(keyPath),
+            cert: fs.readFileSync(certPath)
+        };
+    }
+
+    // Generate a temporary self-signed certificate for localhost
+    console.warn('No SSL cert/key provided. Generating a temporary self-signed certificate for https://localhost:' + SSL_PORT);
+    const attrs = [{ name: 'commonName', value: 'localhost' }];
+    const pems = selfsigned.generate(attrs, { days: 365 });
+    return { key: pems.private, cert: pems.cert };
+}
+
 // Middleware
 app.use(cors());
 app.use(bodyParser.json({ limit: '10mb' }));
@@ -478,3 +502,13 @@ app.listen(PORT, () => {
     ========================================
     `);
 });
+
+// Start HTTPS server on SSL_PORT
+try {
+    const sslOptions = loadSslOptions();
+    https.createServer(sslOptions, app).listen(SSL_PORT, () => {
+        console.log(`HTTPS server running on: https://localhost:${SSL_PORT}`);
+    });
+} catch (err) {
+    console.error('Failed to start HTTPS server:', err);
+}