fix: 套装方案对比仅商业认证用户可用，美化入口按钮

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/views/KitExport.vue

@@ -109,11 +109,15 @@
 
 <script setup>
 import { ref, computed, onMounted, watch } from 'vue'
+import { useRouter } from 'vue-router'
+import { useAuthStore } from '../stores/auth'
 import { useOilsStore } from '../stores/oils'
 import { useRecipesStore } from '../stores/recipes'
 import { useUiStore } from '../stores/ui'
 import { useKitCost } from '../composables/useKitCost'
 
+const router = useRouter()
+const auth = useAuthStore()
 const oils = useOilsStore()
 const recipeStore = useRecipesStore()
 const ui = useUiStore()
@@ -125,6 +129,10 @@ const sellingPrices = ref({})
 const activeKitData = computed(() => kitAnalysis.value.find(k => k.id === activeKit.value))
 
 onMounted(async () => {
+  if (!auth.isBusiness && !auth.isAdmin) {
+    router.replace('/projects')
+    return
+  }
   if (!oils.oilNames.length) await oils.loadOils()
   if (!recipeStore.recipes.length) await recipeStore.loadRecipes()
   loadSellingPrices()