refactor(errors): migrate decisions to {code,msg}

lib/api/posts.ts

@@ -1,5 +1,5 @@
 import { addNotification } from "@/lib/api/notifications"
-import { allow, deny } from "@/lib/policy/assert"
+import { allow, deny } from "@/lib/decision"
 import { useAuthStore } from "@/store/auth"
 import { usePostStore } from "@/store/posts"
 
@@ -18,12 +18,12 @@ export function listPostsByAuthor(userId: string) {
 export function togglePostLike(postId: string) {
   const user = useAuthStore.getState().user
   if (!user) {
-    return deny("AUTH_REQUIRED", "请先登录")
+    return deny(401, "请先登录")
   }
 
   const post = usePostStore.getState().posts.find((item) => item.id === postId)
   if (!post) {
-    return deny("NOT_FOUND", "帖子不存在")
+    return deny(404, "帖子不存在")
   }
 
   const shouldNotify = !post.liked