fix: skip JSON body parsing for filebrowser upload routes

express.json() middleware was consuming the binary file body before the
upload handler could drain it, causing 404/parse errors on file uploads.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

neode-ui/mock-backend.js

@@ -40,7 +40,13 @@ const corsOptions = {
 }
 
 app.use(cors(corsOptions))
-app.use(express.json({ limit: '50mb' }))
+// Skip JSON body parsing for filebrowser upload routes (binary file bodies)
+app.use((req, res, next) => {
+  if (req.path.startsWith('/app/filebrowser/api/resources') && req.method === 'POST') {
+    return next()
+  }
+  express.json({ limit: '50mb' })(req, res, next)
+})
 app.use(cookieParser())
 
 // Mock session storage