fix: 修复轮询系统缓存不一致和可观测性问题

- OnCardStatusChanged/Enabled/Disabled 添加 InvalidateCardCache，
  解决 Refresh API 更新 DB 后 polling 缓存仍为旧值的 bug
- AssetResolveResponse 的 enable_polling/network_status 去掉
  omitempty，解决 false/0 时字段从响应中消失的问题
- Scheduler/Initializer/PackageHandler 增加 INFO 级别日志，
  可通过日志判断轮询是否工作、处理了哪些卡

internal/polling/initializer.go

@@ -199,6 +199,8 @@ func (p *PollingInitializer) initBatch(ctx context.Context, cards []*model.IotCa
 	cardCacheTTL := 7 * 24 * time.Hour
 	pipe := p.redis.Pipeline()
 	cmdCount := 0
+	enqueuedCards := 0
+	skippedCards := 0
 
 	flushPipe := func() {
 		if cmdCount == 0 {
@@ -214,8 +216,10 @@ func (p *PollingInitializer) initBatch(ctx context.Context, cards []*model.IotCa
 	for _, card := range cards {
 		cfg := p.configMgr.MatchConfig(card)
 		if cfg == nil {
+			skippedCards++
 			continue
 		}
+		enqueuedCards++
 
 		shardID := int(card.ID) % p.queueMgr.shardCount
 		cardIDStr := fmt.Sprintf("%d", card.ID)
@@ -273,6 +277,10 @@ func (p *PollingInitializer) initBatch(ctx context.Context, cards []*model.IotCa
 	}
 
 	flushPipe()
+	p.logger.Info("批量初始化完成",
+		zap.Int("total", len(cards)),
+		zap.Int("enqueued", enqueuedCards),
+		zap.Int("skipped_no_config", skippedCards))
 	return nil
 }