Initial MUH app implementation

frontend/src/App.tsx

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+import { Navigate, Route, Routes } from "react-router-dom";
+import { SessionProvider, useSession } from "./lib/session";
+import AppShell from "./layout/AppShell";
+import HomePage from "./pages/HomePage";
+import LoginPage from "./pages/LoginPage";
+import SampleRegistrationPage from "./pages/SampleRegistrationPage";
+import AnamnesisPage from "./pages/AnamnesisPage";
+import AntibiogramPage from "./pages/AntibiogramPage";
+import TherapyPage from "./pages/TherapyPage";
+import AdministrationPage from "./pages/AdministrationPage";
+import PortalPage from "./pages/PortalPage";
+
+function ProtectedRoutes() {
+  const { user } = useSession();
+
+  if (!user) {
+    return <Navigate to="/" replace />;
+  }
+
+  return (
+    <Routes>
+      <Route element={<AppShell />}>
+        <Route path="/home" element={<HomePage />} />
+        <Route path="/samples/new" element={<SampleRegistrationPage />} />
+        <Route path="/samples/:sampleId/registration" element={<SampleRegistrationPage />} />
+        <Route path="/samples/:sampleId/anamnesis" element={<AnamnesisPage />} />
+        <Route path="/samples/:sampleId/antibiogram" element={<AntibiogramPage />} />
+        <Route path="/samples/:sampleId/therapy" element={<TherapyPage />} />
+        <Route path="/admin" element={<AdministrationPage />} />
+        <Route path="/portal" element={<PortalPage />} />
+      </Route>
+      <Route path="*" element={<Navigate to="/home" replace />} />
+    </Routes>
+  );
+}
+
+function ApplicationRouter() {
+  const { user } = useSession();
+  if (!user) {
+    return (
+      <Routes>
+        <Route path="*" element={<LoginPage />} />
+      </Routes>
+    );
+  }
+  return <ProtectedRoutes />;
+}
+
+export default function App() {
+  return (
+    <SessionProvider>
+      <ApplicationRouter />
+    </SessionProvider>
+  );
+}