T07b: frontend feature pages — companies + contacts + settings + audit + dashboard + search

- 11 new feature pages (CompaniesList/Detail/Form, ContactsList/Detail/Form,
  SettingsProfile/Roles/Users, AuditLog, GlobalSearchResults)
- 3 page updates (Dashboard with StatCard+ActivityFeed, Settings with tree nav+Outlet,
  TopBar with SearchDropdown)
- 13 new routes in routes/index.tsx
- i18n updates (de.json + en.json) with companies/contacts/settings/audit/search keys
- 12 new test files + 2 existing test fixes (TopBar, AppShell)
- 7 shared components (DataGrid, Tabs, SearchDropdown, CsvImportDialog, StatCard,
  ActivityFeed, UnsavedChangesGuard)
- 16 new API hooks in hooks.ts
- Verification: 141 tests pass, build succeeds, tsc --noEmit clean

frontend/src/routes/index.tsx

@@ -6,7 +6,18 @@ import { LoginPage } from '@/pages/Login';
 import { PasswordResetRequestPage } from '@/pages/PasswordResetRequest';
 import { PasswordResetConfirmPage } from '@/pages/PasswordResetConfirm';
 import { DashboardPage } from '@/pages/Dashboard';
+import { CompaniesListPage } from '@/pages/CompaniesList';
+import { CompanyDetailPage } from '@/pages/CompanyDetail';
+import { CompanyFormPage } from '@/pages/CompanyForm';
+import { ContactsListPage } from '@/pages/ContactsList';
+import { ContactDetailPage } from '@/pages/ContactDetail';
+import { ContactFormPage } from '@/pages/ContactForm';
+import { AuditLogPage } from '@/pages/AuditLog';
+import { GlobalSearchResultsPage } from '@/pages/GlobalSearchResults';
 import { SettingsPage } from '@/pages/Settings';
+import { SettingsProfilePage } from '@/pages/SettingsProfile';
+import { SettingsRolesPage } from '@/pages/SettingsRoles';
+import { SettingsUsersPage } from '@/pages/SettingsUsers';
 
 const router = createBrowserRouter([
   {
@@ -28,9 +39,27 @@ const router = createBrowserRouter([
       </ProtectedRoute>
     ),
     children: [
-      { path: '/dashboard', element: <DashboardPage /> },
-      { path: '/settings', element: <SettingsPage /> },
       { path: '/', element: <DashboardPage /> },
+      { path: '/dashboard', element: <DashboardPage /> },
+      { path: '/companies', element: <CompaniesListPage /> },
+      { path: '/companies/new', element: <CompanyFormPage /> },
+      { path: '/companies/:id', element: <CompanyDetailPage /> },
+      { path: '/companies/:id/edit', element: <CompanyFormPage /> },
+      { path: '/contacts', element: <ContactsListPage /> },
+      { path: '/contacts/new', element: <ContactFormPage /> },
+      { path: '/contacts/:id', element: <ContactDetailPage /> },
+      { path: '/contacts/:id/edit', element: <ContactFormPage /> },
+      { path: '/audit-log', element: <AuditLogPage /> },
+      { path: '/search', element: <GlobalSearchResultsPage /> },
+      {
+        path: '/settings',
+        element: <SettingsPage />,
+        children: [
+          { path: 'profile', element: <SettingsProfilePage /> },
+          { path: 'roles', element: <SettingsRolesPage /> },
+          { path: 'users', element: <SettingsUsersPage /> },
+        ],
+      },
     ],
   },
 ]);