feat(admin): add admin endpoint to list user devices with JPush registration IDs

- Add AdminDeviceTokenResponse DTO including push_token (RegistrationID) for push debugging
- Add DeviceTokenToAdminResponse and DeviceTokensToAdminResponse converters
- Inject PushService into AdminUserHandler for retrieving user devices
- Register GET /api/v1/admin/users/:id/devices route for querying target user's device tokens

internal/service/push_worker.go

@@ -342,14 +342,9 @@ func (w *PushWorker) handleMsg(streamMsg redis.XMessage) error {
 		allTargetIDs = append(allTargetIDs, p.UserID)
 	}
 
-	var offlineTargetIDs []string
-	if w.publisher != nil && len(allTargetIDs) > 0 {
-		_, offlineTargetIDs = w.publisher.FilterOnline(allTargetIDs)
-	} else {
-		offlineTargetIDs = allTargetIDs
-	}
-
-	for _, uid := range offlineTargetIDs {
+	// 直接对所有参与者推送（不按 WS 在线过滤）：
+	// 多设备场景下某端在线不代表所有端在线，由 PushChatMessage 推送到用户所有移动设备
+	for _, uid := range allTargetIDs {
 		if pushErr := w.pushSvc.PushChatMessage(ctx, uid, pushMsg.ConversationID, &sender, conv.Type, convName, message, groupID, groupAvatar); pushErr != nil {
 			zap.L().Debug("push worker: JPush chat message failed",
 				zap.String("userID", uid),