refactor(auth): decouple auth from push via domain events

Introduce internal/listener as a domain event bus so oauth and user
modules emit AdminLoggedIn without depending on admin/push. Register
push handlers explicitly at the router composition root, replacing
init() side-effect registration and blank imports.

internal/apps/admin/push/custom_events/admin_login.go

@@ -9,7 +9,7 @@ import (
 	"time"
 
 	"github.com/Rain-kl/Wavelet/internal/apps/admin/push"
-	"github.com/Rain-kl/Wavelet/internal/model"
+	"github.com/Rain-kl/Wavelet/internal/listener"
 )
 
 // AdminLogin is the metadata definition for the admin login event.
@@ -24,20 +24,15 @@ var AdminLogin = push.EventMetadata{
 	Description: "当管理员成功登录系统时触发此通知",
 }
 
-func init() {
-	push.RegisterBuiltInEvent(AdminLogin)
-}
-
-// TriggerAdminLoginEvent triggers the admin login event asynchronously.
-func TriggerAdminLoginEvent(ctx context.Context, user *model.User, ip string) {
-	if user == nil || !user.IsAdmin {
+func handleAdminLogin(ctx context.Context, event listener.AdminLoggedIn) {
+	if event.User == nil {
 		return
 	}
 
 	body := map[string]any{
-		"user": user,
-		"ip":   ip,
+		"user": event.User,
+		"ip":   event.IP,
 		"time": time.Now().Format("2006-01-02 15:04:05"),
 	}
 	push.DefaultTrigger.Trigger(ctx, AdminLogin, body)
-}
+}

internal/apps/admin/push/custom_events/register.go

@@ -0,0 +1,17 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package custom_events
+
+import (
+	"github.com/Rain-kl/Wavelet/internal/apps/admin/push"
+	"github.com/Rain-kl/Wavelet/internal/listener"
+)
+
+// Register wires push notification handlers for domain events and registers
+// built-in event metadata. Must be called once during application bootstrap
+// before push.SyncEvents.
+func Register() {
+	push.RegisterBuiltInEvent(AdminLogin)
+	listener.OnAdminLoggedIn(handleAdminLogin)
+}