feat(notifications): add notification system and wire order/dispute events

lib/api/notifications.ts

@@ -1,5 +1,33 @@
+import { allow, deny } from "@/lib/policy/assert"
+import type { Notification } from "@/lib/types"
+import { useAuthStore } from "@/store/auth"
 import { useNotificationStore } from "@/store/notifications"
 
 export function listNotifications() {
   return useNotificationStore.getState().notifications
 }
+
+function isNotificationEnabled(type: Notification["type"]) {
+  const prefs = useAuthStore.getState().notificationPrefs
+  if (type === "order") return prefs.order
+  if (type === "community") return prefs.community
+  return prefs.system
+}
+
+export function addNotification(input: {
+  type: Notification["type"]
+  title: string
+  content: string
+  link?: string
+}) {
+  if (!isNotificationEnabled(input.type)) {
+    return deny("IDEMPOTENT_NOOP", "该类通知已关闭")
+  }
+
+  useNotificationStore.getState().addNotification(input)
+  return allow()
+}
+
+export function markNotificationAsRead(notificationId: string) {
+  useNotificationStore.getState().markAsRead(notificationId)
+}