fix: increase express.json limit to 50mb to allow saving QR codes with large custom logos

api/server.js

@@ -17,7 +17,8 @@ const allowedOrigins = [
 ].filter(Boolean);
 
 app.use(cors({ origin: allowedOrigins, credentials: true }));
-app.use(express.json());
+app.use(express.json({ limit: '50mb' }));
+app.use(express.urlencoded({ limit: '50mb', extended: true }));
 app.use(cookieParser());
 
 // Routes