feat(frontend): Day 6 - frontend basic architecture completed

frontend/src/App.tsx

@@ -0,0 +1,19 @@
+import { Routes, Route, Navigate } from 'react-router-dom'
+import MainLayout from './layouts/MainLayout'
+import HomePage from './pages/HomePage'
+import AgentPage from './pages/AgentPage'
+
+function App() {
+  return (
+    <Routes>
+      <Route path="/" element={<MainLayout />}>
+        <Route index element={<HomePage />} />
+        <Route path="agent/:agentId" element={<AgentPage />} />
+        <Route path="*" element={<Navigate to="/" replace />} />
+      </Route>
+    </Routes>
+  )
+}
+
+export default App
+