feat: 新增卡状态轮询任务类型常量及 verbose_log 配置

constants.go: 新增 TaskTypePollingCardStatus = "polling:card_status"
config.go: 新增 PollingConfig struct 含 VerboseLog bool
config.yaml: polling.verbose_log 默认 false

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

pkg/config/defaults/config.yaml

@@ -116,6 +116,10 @@ gateway:
   app_secret: "BZeQttaZQt0i73moF"
   timeout: 30
 
+# 轮询配置
+polling:
+  verbose_log: false  # 是否开启详细日志（环境变量：JUNHONG_POLLING_VERBOSE_LOG）
+
 # 轮询自动触发配置
 polling_auto_trigger:
   enable_auto_trigger: true