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

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" : ""}`}>