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 />} />

frontend/src/layout/AppShell.tsx

@@ -3,6 +3,7 @@ import { useSession } from "../lib/session";
 
 const PAGE_TITLES: Record<string, string> = {
   "/home": "Startseite",
+  "/admin/dashboard": "Admin Dashboard",
   "/samples/new": "Neuanlage einer Probe",
   "/portal": "MUH-Portal",
   "/report-template": "Bericht",
@@ -62,12 +63,65 @@ export default function AppShell() {
 
         <nav className="sidebar__nav">
           {user?.role === "ADMIN" ? (
-            <NavLink
-              to="/portal"
-              className={({ isActive }) => `nav-link ${isActive ? "is-active" : ""}`}
-            >
-              Benutzerverwaltung
-            </NavLink>
+            <>
+              <NavLink
+                to="/admin/dashboard"
+                className={({ isActive }) => `nav-link ${isActive ? "is-active" : ""}`}
+              >
+                Dashboard
+              </NavLink>
+              <NavLink to="/samples/new" className={({ isActive }) => `nav-link ${isActive ? "is-active" : ""}`}>
+                Neue Probe
+              </NavLink>
+
+              <div className="nav-group">
+                <div className="nav-group__label">Verwaltung</div>
+                <div className="nav-subnav">
+                  <div className="nav-subgroup">
+                    <div className="nav-subgroup__label">Vorlagen</div>
+                    <div className="nav-subnav nav-subnav--nested">
+                      <NavLink to="/report-template" className={({ isActive }) => `nav-sublink ${isActive ? "is-active" : ""}`}>
+                        Bericht
+                      </NavLink>
+                    </div>
+                  </div>
+                  <NavLink to="/admin/landwirte" className={({ isActive }) => `nav-sublink ${isActive ? "is-active" : ""}`}>
+                    Landwirte
+                  </NavLink>
+                  <NavLink to="/admin/medikamente" className={({ isActive }) => `nav-sublink ${isActive ? "is-active" : ""}`}>
+                    Medikamente
+                  </NavLink>
+                  <NavLink to="/admin/erreger" className={({ isActive }) => `nav-sublink ${isActive ? "is-active" : ""}`}>
+                    Erreger
+                  </NavLink>
+                  <NavLink to="/admin/antibiogramm" className={({ isActive }) => `nav-sublink ${isActive ? "is-active" : ""}`}>
+                    Antibiogramm
+                  </NavLink>
+                  <NavLink to="/admin/benutzer" className={({ isActive }) => `nav-sublink ${isActive ? "is-active" : ""}`}>
+                    Benutzer
+                  </NavLink>
+                </div>
+              </div>
+
+              <div className="nav-group">
+                <div className="nav-group__label">Suche</div>
+                <div className="nav-subnav">
+                  <NavLink to="/search/landwirt" className={({ isActive }) => `nav-sublink ${isActive ? "is-active" : ""}`}>
+                    Landwirt
+                  </NavLink>
+                  <NavLink to="/search/probe" className={({ isActive }) => `nav-sublink ${isActive ? "is-active" : ""}`}>
+                    Probe
+                  </NavLink>
+                  <NavLink to="/search/kalendar" className={({ isActive }) => `nav-sublink ${isActive ? "is-active" : ""}`}>
+                    Kalendar
+                  </NavLink>
+                </div>
+              </div>
+
+              <NavLink to="/portal" className={({ isActive }) => `nav-link ${isActive ? "is-active" : ""}`}>
+                Portal
+              </NavLink>
+            </>
           ) : (
             <>
               <NavLink to="/home" className={({ isActive }) => `nav-link ${isActive ? "is-active" : ""}`}>

frontend/src/pages/AdminDashboardPage.tsx

@@ -0,0 +1,192 @@
+import { useEffect, useState } from "react";
+import { useNavigate } from "react-router-dom";
+import { apiGet } from "../lib/api";
+import type { DashboardOverview } from "../lib/types";
+
+interface AdminStats {
+  totalSamples: number;
+  openSamples: number;
+  completedToday: number;
+  nextSampleNumber: number;
+}
+
+export default function AdminDashboardPage() {
+  const navigate = useNavigate();
+  const [stats, setStats] = useState<AdminStats | null>(null);
+  const [loading, setLoading] = useState(true);
+
+  useEffect(() => {
+    async function loadStats() {
+      try {
+        const dashboard = await apiGet<DashboardOverview>("/dashboard");
+        setStats({
+          totalSamples: dashboard.nextSampleNumber - 1,
+          openSamples: dashboard.openSamples,
+          completedToday: dashboard.completedToday,
+          nextSampleNumber: dashboard.nextSampleNumber,
+        });
+      } finally {
+        setLoading(false);
+      }
+    }
+
+    void loadStats();
+  }, []);
+
+  const adminModules = [
+    {
+      title: "Landwirte",
+      description: "Verwaltung der Landwirte und Betriebe",
+      icon: "👨‍🌾",
+      route: "/admin/landwirte",
+      color: "#4a7c59",
+    },
+    {
+      title: "Benutzer",
+      description: "Benutzerverwaltung und Berechtigungen",
+      icon: "👥",
+      route: "/admin/benutzer",
+      color: "#5b7ba8",
+    },
+    {
+      title: "Medikamente",
+      description: "Verwaltung der Medikamentenkataloge",
+      icon: "💊",
+      route: "/admin/medikamente",
+      color: "#8b5a7c",
+    },
+    {
+      title: "Erreger",
+      description: "Verwaltung der Erreger und Kürzel",
+      icon: "🦠",
+      route: "/admin/erreger",
+      color: "#7c5a5a",
+    },
+    {
+      title: "Antibiogramm",
+      description: "Verwaltung der Antibiotika-Kataloge",
+      icon: "📊",
+      route: "/admin/antibiogramm",
+      color: "#5a7c7c",
+    },
+    {
+      title: "Berichtsvorlage",
+      description: "Gestaltung der PDF-Berichtsvorlagen",
+      icon: "📄",
+      route: "/report-template",
+      color: "#7c7c5a",
+    },
+  ];
+
+  return (
+    <div className="page-stack">
+      {/* Header Bereich */}
+      <section className="hero-card admin-hero">
+        <div>
+          <p className="eyebrow">Administration</p>
+          <h3>Administrator Dashboard</h3>
+          <p className="muted-text">
+            Verwalten Sie Landwirte, Benutzer, Medikamente, Erreger und Systemeinstellungen.
+          </p>
+        </div>
+      </section>
+
+      {/* Statistik-Karten */}
+      <section className="metrics-grid admin-metrics">
+        <article className="metric-card metric-card--primary">
+          <span className="metric-card__label">Nächste Probennummer</span>
+          <strong className="metric-card__value--large">
+            {loading ? "..." : stats?.nextSampleNumber}
+          </strong>
+        </article>
+        <article className="metric-card">
+          <span className="metric-card__label">Offene Proben</span>
+          <strong>{loading ? "..." : stats?.openSamples}</strong>
+        </article>
+        <article className="metric-card">
+          <span className="metric-card__label">Heute abgeschlossen</span>
+          <strong>{loading ? "..." : stats?.completedToday}</strong>
+        </article>
+        <article className="metric-card">
+          <span className="metric-card__label">Gesamtproben</span>
+          <strong>{loading ? "..." : stats?.totalSamples}</strong>
+        </article>
+      </section>
+
+      {/* Admin Module Grid */}
+      <section className="admin-modules-section">
+        <div className="section-card__header">
+          <div>
+            <p className="eyebrow">Verwaltung</p>
+            <h3>Verwaltungsmodule</h3>
+          </div>
+        </div>
+
+        <div className="admin-modules-grid">
+          {adminModules.map((module) => (
+            <button
+              key={module.route}
+              type="button"
+              className="admin-module-card"
+              onClick={() => navigate(module.route)}
+              style={{ "--module-color": module.color } as React.CSSProperties}
+            >
+              <span className="admin-module-card__icon">{module.icon}</span>
+              <div className="admin-module-card__content">
+                <strong>{module.title}</strong>
+                <span className="muted-text">{module.description}</span>
+              </div>
+              <span className="admin-module-card__arrow">→</span>
+            </button>
+          ))}
+        </div>
+      </section>
+
+      {/* Schnellzugriffe */}
+      <section className="quick-actions-section">
+        <div className="section-card">
+          <div className="section-card__header">
+            <div>
+              <p className="eyebrow">Schnellzugriff</p>
+              <h3>Häufige Aktionen</h3>
+            </div>
+          </div>
+          <div className="quick-actions-grid">
+            <button
+              type="button"
+              className="quick-action-button"
+              onClick={() => navigate("/samples/new")}
+            >
+              <span>➕</span>
+              <span>Neue Probe anlegen</span>
+            </button>
+            <button
+              type="button"
+              className="quick-action-button"
+              onClick={() => navigate("/search/probe")}
+            >
+              <span>🔍</span>
+              <span>Probe suchen</span>
+            </button>
+            <button
+              type="button"
+              className="quick-action-button"
+              onClick={() => navigate("/portal")}
+            >
+              <span>📧</span>
+              <span>Portal & Berichte</span>
+            </button>
+            <button
+              type="button"
+              className="quick-action-button"
+              onClick={() => navigate("/search/landwirt")}
+            >
+              <span>👤</span>
+              <span>Landwirt suchen</span>
+            </button>
+          </div>
+        </div>
+      </section>
+    </div>
+  );
+}

frontend/src/pages/LoginPage.tsx

@@ -1,4 +1,5 @@
 import { FormEvent, useState } from "react";
+import { useNavigate } from "react-router-dom";
 import { apiPost } from "../lib/api";
 import { useSession } from "../lib/session";
 import type { SessionResponse } from "../lib/types";
@@ -28,6 +29,7 @@ export default function LoginPage() {
   });
   const [feedback, setFeedback] = useState<FeedbackState>(null);
   const { setSession } = useSession();
+  const navigate = useNavigate();
 
   function unlockLoginInputs() {
     setLoginInputsUnlocked(true);
@@ -50,6 +52,8 @@ export default function LoginPage() {
         password,
       });
       setSession(response);
+      // Admin zum Dashboard, Kunden zur Startseite
+      navigate(response.user.role === "ADMIN" ? "/admin/dashboard" : "/home");
     } catch (loginError) {
       setFeedback({ type: "error", text: (loginError as Error).message });
     }
@@ -88,6 +92,8 @@ export default function LoginPage() {
         text: `Registrierung erfolgreich. Willkommen ${response.user.companyName ?? response.user.displayName}.`,
       });
       setSession(response);
+      // Admin zum Dashboard, Kunden zur Startseite
+      navigate(response.user.role === "ADMIN" ? "/admin/dashboard" : "/home");
     } catch (registrationError) {
       setFeedback({ type: "error", text: (registrationError as Error).message });
     }

frontend/src/styles/global.css

@@ -1088,6 +1088,162 @@ a {
   min-height: 88px;
 }
 
+/* Admin Dashboard Styles */
+.admin-hero {
+  background: linear-gradient(135deg, rgba(90, 123, 168, 0.15) 0%, rgba(74, 124, 89, 0.1) 100%);
+}
+
+.admin-metrics {
+  grid-template-columns: repeat(4, minmax(0, 1fr));
+}
+
+@media (max-width: 1024px) {
+  .admin-metrics {
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+  }
+}
+
+@media (max-width: 640px) {
+  .admin-metrics {
+    grid-template-columns: 1fr;
+  }
+}
+
+.metric-card--primary {
+  background: linear-gradient(135deg, rgba(90, 123, 168, 0.25) 0%, rgba(90, 123, 168, 0.1) 100%);
+  border-color: rgba(90, 123, 168, 0.3);
+}
+
+.metric-card__value--large {
+  font-size: 2.5rem;
+  background: linear-gradient(135deg, var(--text) 0%, #5b7ba8 100%);
+  -webkit-background-clip: text;
+  -webkit-text-fill-color: transparent;
+  background-clip: text;
+}
+
+.admin-modules-section {
+  margin-top: 8px;
+}
+
+.admin-modules-grid {
+  display: grid;
+  grid-template-columns: repeat(3, minmax(0, 1fr));
+  gap: 16px;
+  margin-top: 20px;
+}
+
+@media (max-width: 1024px) {
+  .admin-modules-grid {
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+  }
+}
+
+@media (max-width: 640px) {
+  .admin-modules-grid {
+    grid-template-columns: 1fr;
+  }
+}
+
+.admin-module-card {
+  display: flex;
+  align-items: center;
+  gap: 16px;
+  padding: 24px;
+  background: rgba(255, 255, 255, 0.7);
+  border: 1px solid rgba(255, 255, 255, 0.5);
+  border-radius: var(--radius-xl);
+  box-shadow: var(--shadow);
+  cursor: pointer;
+  transition: all 0.2s ease;
+  text-align: left;
+  border-left: 4px solid var(--module-color, #5b7ba8);
+}
+
+.admin-module-card:hover {
+  transform: translateY(-2px);
+  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
+  background: rgba(255, 255, 255, 0.9);
+}
+
+.admin-module-card__icon {
+  font-size: 2rem;
+  line-height: 1;
+}
+
+.admin-module-card__content {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+  flex: 1;
+}
+
+.admin-module-card__content strong {
+  font-size: 1.1rem;
+  color: var(--text);
+}
+
+.admin-module-card__content .muted-text {
+  font-size: 0.85rem;
+}
+
+.admin-module-card__arrow {
+  font-size: 1.5rem;
+  color: var(--muted);
+  opacity: 0.5;
+  transition: opacity 0.2s ease;
+}
+
+.admin-module-card:hover .admin-module-card__arrow {
+  opacity: 1;
+}
+
+.quick-actions-section {
+  margin-top: 8px;
+}
+
+.quick-actions-grid {
+  display: grid;
+  grid-template-columns: repeat(4, minmax(0, 1fr));
+  gap: 12px;
+  margin-top: 20px;
+}
+
+@media (max-width: 1024px) {
+  .quick-actions-grid {
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+  }
+}
+
+@media (max-width: 640px) {
+  .quick-actions-grid {
+    grid-template-columns: 1fr;
+  }
+}
+
+.quick-action-button {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  padding: 16px 20px;
+  background: rgba(255, 255, 255, 0.5);
+  border: 1px solid rgba(255, 255, 255, 0.4);
+  border-radius: var(--radius-lg);
+  cursor: pointer;
+  transition: all 0.2s ease;
+  font-size: 0.95rem;
+  color: var(--text);
+}
+
+.quick-action-button:hover {
+  background: rgba(255, 255, 255, 0.9);
+  box-shadow: var(--shadow);
+}
+
+.quick-action-button span:first-child {
+  font-size: 1.25rem;
+}
+
 .dialog-backdrop {
   position: fixed;
   inset: 0;