Improve admin panel UX with toasts, evolution CRUD, sorting, drag-and-drop, and responsive layout

Add sonner toast notifications to all mutations, evolution management backend
(CRUD endpoints with search/pagination) and frontend (form modal with pokemon
selector, paginated list page), sortable AdminTable columns (Region/Gen/Year
on Games), drag-and-drop route reordering via @dnd-kit, skeleton loading states,
card-styled table wrappers, and responsive mobile nav in AdminLayout.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/pages/admin/AdminGames.tsx

@@ -21,9 +21,9 @@ export function AdminGames() {
   const columns: Column<Game>[] = [
     { header: 'Name', accessor: (g) => g.name },
     { header: 'Slug', accessor: (g) => g.slug },
-    { header: 'Region', accessor: (g) => g.region },
-    { header: 'Gen', accessor: (g) => g.generation },
-    { header: 'Year', accessor: (g) => g.releaseYear ?? '-' },
+    { header: 'Region', accessor: (g) => g.region, sortKey: (g) => g.region },
+    { header: 'Gen', accessor: (g) => g.generation, sortKey: (g) => g.generation },
+    { header: 'Year', accessor: (g) => g.releaseYear ?? '-', sortKey: (g) => g.releaseYear ?? 0 },
     {
       header: 'Actions',
       accessor: (g) => (