Admin Dashboard hinzugefügt: Modernes Dashboard für Administratoren mit Statistiken, Verwaltungsmodulen und Schnellzugriffen

frontend/src/App.tsx

@@ -2,6 +2,7 @@ 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 AdminDashboardPage from "./pages/AdminDashboardPage";
 import LoginPage from "./pages/LoginPage";
 import SampleRegistrationPage from "./pages/SampleRegistrationPage";
 import AnamnesisPage from "./pages/AnamnesisPage";
@@ -30,7 +31,8 @@ function ProtectedRoutes() {
   return (
     <Routes>
       <Route element={<AppShell />}>
-        <Route path="/home" element={<HomePage />} />
+        <Route path="/home" element={isAdmin ? <AdminDashboardPage /> : <HomePage />} />
+        <Route path="/admin/dashboard" element={<AdminDashboardPage />} />
         <Route path="/samples/new" element={<SampleRegistrationPage />} />
         <Route path="/samples/:sampleId/registration" element={<SampleRegistrationPage />} />
         <Route path="/samples/:sampleId/anamnesis" element={<AnamnesisPage />} />