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

lib/api/notifications.ts

@@ -1,4 +1,4 @@
-import { allow, deny } from "@/lib/policy/assert"
+import { allow, deny } from "@/lib/decision"
 import type { Notification } from "@/lib/types"
 import { useAuthStore } from "@/store/auth"
 import { useNotificationStore } from "@/store/notifications"
@@ -21,7 +21,7 @@ export function addNotification(input: {
   link?: string
 }) {
   if (!isNotificationEnabled(input.type)) {
-    return deny("IDEMPOTENT_NOOP", "该类通知已关闭")
+    return deny(400, "该类通知已关闭")
   }
 
   useNotificationStore.getState().addNotification(input)