Fix: Improve routing logic to prevent 404s on custom domains

backend/server.js

@@ -133,11 +133,10 @@ app.get('/sentinel', (req, res) => res.sendFile(path.join(__dirname, 'public', '
 app.get('/manifesto', (req, res) => res.sendFile(path.join(__dirname, 'public', 'manifesto.html')));
 app.get('/broadcast', (req, res) => res.sendFile(path.join(__dirname, 'public', 'broadcast.html')));
 
-app.use((req, res, next) => {
-  if (req.method === 'GET' && !req.path.startsWith('/api')) {
-    return res.redirect('/');
-  }
-  next();
+// Catch-all for React/Frontend routes should come AFTER specific API/Static routes
+app.get('*', (req, res, next) => {
+  if (req.path.startsWith('/api')) return next();
+  res.sendFile(path.join(__dirname, 'public', 'index.html'));
 });
 
 app.get('/api/status/sentinel-history', (req, res) => {