feat(admin): implement management UI and CRUD APIs for all entities

Add full CRUD operations for Pokemon, Habitats, Items, Recipes, and Configs
Switch package manager from npm to pnpm across the project
Remove static seed data in favor of UI-driven data management

frontend/src/router/index.ts

@@ -6,6 +6,7 @@ import HabitatDetail from '../views/HabitatDetail.vue';
 import ItemsList from '../views/ItemsList.vue';
 import ItemDetail from '../views/ItemDetail.vue';
 import RecipeDetail from '../views/RecipeDetail.vue';
+import AdminView from '../views/AdminView.vue';
 
 export const router = createRouter({
   history: createWebHistory(),
@@ -17,7 +18,8 @@ export const router = createRouter({
     { path: '/habitats/:id', component: HabitatDetail },
     { path: '/items', component: ItemsList },
     { path: '/items/:id', component: ItemDetail },
-    { path: '/recipes/:id', component: RecipeDetail }
+    { path: '/recipes/:id', component: RecipeDetail },
+    { path: '/admin', component: AdminView }
   ],
   scrollBehavior: () => ({ top: 0 })
 });