Lagerort-QR + Zuordnen per Scan

Web: druckbare QR-Etiketten fuer Lagerorte (Locations-Seite) und Route /l/<id>
(zeigt den Ort im Browser). Geteilter QR-Helfer (web/src/qr.jsx).

iOS: neuer Ablauf "Ort zuordnen" - erst Einzelstueck-QR (…/i/<UID>) scannen, dann
Lagerort-QR (…/l/<ID>); das Stueck wird dem Ort zugewiesen, danach gleich das
naechste. Plus die zuvor gebaute "Nachschlagen"-Kachel.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/src/App.jsx

@@ -14,6 +14,7 @@ import Groups from "./pages/Groups";
 import Categories from "./pages/Categories";
 import Shops from "./pages/Shops";
 import ItemResolve from "./pages/ItemResolve";
+import LocationResolve from "./pages/LocationResolve";
 import Locations from "./pages/Locations";
 import PackageTypes from "./pages/PackageTypes";
 import Units from "./pages/Units";
@@ -136,6 +137,7 @@ export default function App() {
       <Route path="/products/new" element={<Protected adminOnly><ProductForm /></Protected>} />
       <Route path="/products/:id" element={<Protected><ProductForm /></Protected>} />
       <Route path="/i/:uid" element={<Protected><ItemResolve /></Protected>} />
+      <Route path="/l/:id" element={<Protected><LocationResolve /></Protected>} />
       <Route path="/groups" element={<Protected><Groups /></Protected>} />
       <Route path="/categories" element={<Protected><Categories /></Protected>} />
       <Route path="/shopping" element={<Protected><ShoppingList /></Protected>} />