fix(01-02): 修复实名激活任务断链，为 PollingHandler 注入 asynq.Client

- PollingHandler struct 新增 asynqClient *asynq.Client 字段
- NewPollingHandler 构造函数新增 asynqClient 参数（redis 之后，gatewayClient 之前）
- triggerFirstRealnameActivation 改用 asynqClient.EnqueueContext，删除 RPush 降级方案
- 删除 _ = task 废弃代码
- registerPollingHandlers 传入 h.asynqClient 参数

internal/task/polling_handler.go

@@ -30,6 +30,7 @@ type PollingTaskPayload struct {
 type PollingHandler struct {
 	db                    *gorm.DB
 	redis                 *redis.Client
+	asynqClient           *asynq.Client // 用于提交 Asynq 任务（如首次实名激活）
 	gatewayClient         *gateway.Client
 	iotCardStore          *postgres.IotCardStore
 	concurrencyStore      *postgres.PollingConcurrencyConfigStore
@@ -44,6 +45,7 @@ type PollingHandler struct {
 func NewPollingHandler(
 	db *gorm.DB,
 	redis *redis.Client,
+	asynqClient *asynq.Client,
 	gatewayClient *gateway.Client,
 	usageService *packagepkg.UsageService,
 	logger *zap.Logger,
@@ -51,6 +53,7 @@ func NewPollingHandler(
 	return &PollingHandler{
 		db:                    db,
 		redis:                 redis,
+		asynqClient:           asynqClient,
 		gatewayClient:         gatewayClient,
 		iotCardStore:          postgres.NewIotCardStore(db, redis),
 		concurrencyStore:      postgres.NewPollingConcurrencyConfigStore(db),
@@ -1097,11 +1100,8 @@ func (h *PollingHandler) triggerFirstRealnameActivation(ctx context.Context, car
 			asynq.Queue(constants.QueueDefault),
 		)
 
-		// 这里需要访问 Asynq Client，暂时使用 Redis 队列
-		// 实际应该通过依赖注入 asynq.Client
-		activationKey := constants.RedisPollingManualQueueKey(constants.TaskTypePackageFirstActivation)
-		if err := h.redis.RPush(ctx, activationKey, string(payloadBytes)).Err(); err != nil {
-			h.logger.Warn("提交激活任务失败",
+		if _, err := h.asynqClient.EnqueueContext(ctx, task); err != nil {
+			h.logger.Warn("提交首次实名激活任务失败",
 				zap.Uint("package_usage_id", pkg.ID),
 				zap.Error(err))
 			continue
@@ -1110,8 +1110,5 @@ func (h *PollingHandler) triggerFirstRealnameActivation(ctx context.Context, car
 		h.logger.Info("已提交首次实名激活任务",
 			zap.Uint("package_usage_id", pkg.ID),
 			zap.Uint("card_id", cardID))
-
-		// 避免未使用变量警告
-		_ = task
 	}
 }