feat(access-logs): 上报并展示边缘缓存状态 cache_status

OpenResty 日志输出 $upstream_cache_status；Agent/协议/ClickHouse 贯通入库。
明细列表与详情按 HIT/MISS 等推导命中、回源、未缓存三态标签。

internal/model/analytics/node_access_log.go

@@ -10,7 +10,7 @@ import (
 
 const (
 	nodeAccessLogTableName     = "of_node_access_logs"
-	nodeAccessLogInsertColumns = "id, node_id, logged_at, remote_addr, region, host, path, user_agent, status_code, bytes_sent, request_length, request_time_ms, created_at"
+	nodeAccessLogInsertColumns = "id, node_id, logged_at, remote_addr, region, host, path, user_agent, cache_status, status_code, bytes_sent, request_length, request_time_ms, created_at"
 )
 
 // NodeAccessLog stores OpenFlare edge node access records in ClickHouse.
@@ -23,6 +23,7 @@ type NodeAccessLog struct {
 	Host          string    `gorm:"column:host"`
 	Path          string    `gorm:"column:path"`
 	UserAgent     string    `gorm:"column:user_agent"`
+	CacheStatus   string    `gorm:"column:cache_status"`
 	StatusCode    int32     `gorm:"column:status_code"`
 	BytesSent     uint64    `gorm:"column:bytes_sent"`
 	RequestLength uint64    `gorm:"column:request_length"`