Add database maintenance tooling

- Implement maintenance hooks (useMaintenanceTables, useVacuumTable, useAnalyzeTable, useReindexTable)
- Add DatabaseMaintenance page and UI for vacuum/analyze/reindex
- Wire new route / admin/database-maintenance and sidebar entry
- Remove DatabaseMaintenance icon usage on page and align with AdminLayout props

src/App.tsx

@@ -70,6 +70,7 @@ const AdminUsers = lazy(() => import("./pages/AdminUsers"));
 const AdminBlog = lazy(() => import("./pages/AdminBlog"));
 const AdminSettings = lazy(() => import("./pages/AdminSettings"));
 const AdminDatabaseStats = lazy(() => import("./pages/AdminDatabaseStats"));
+const DatabaseMaintenance = lazy(() => import("./pages/admin/DatabaseMaintenance"));
 const AdminContact = lazy(() => import("./pages/admin/AdminContact"));
 const AdminEmailSettings = lazy(() => import("./pages/admin/AdminEmailSettings"));
 const ErrorMonitoring = lazy(() => import("./pages/admin/ErrorMonitoring"));
@@ -423,6 +424,14 @@ function AppContent(): React.JSX.Element {
                       </AdminErrorBoundary>
                     } 
                   />
+                  <Route 
+                    path="/admin/database-maintenance" 
+                    element={
+                      <AdminErrorBoundary section="Database Maintenance">
+                        <DatabaseMaintenance />
+                      </AdminErrorBoundary>
+                    } 
+                  />
                   
                   {/* Utility routes - lazy loaded */}
                   <Route path="/force-logout" element={<ForceLogout />} />