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/repository/analytics/node_access_log.go

@@ -36,7 +36,7 @@ func ListNodeAccessLogs(ctx context.Context, filter NodeAccessLogFilter) ([]anal
 	clause, args := buildNodeAccessLogFilterClause(filter)
 	tableName := nodeAccessLogTableName()
 	sql := fmt.Sprintf(`
-SELECT id, node_id, logged_at, remote_addr, region, host, path, user_agent, status_code, bytes_sent, request_length, request_time_ms, created_at
+SELECT 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
 FROM %s
 WHERE %s
 ORDER BY %s`, tableName, clause, nodeAccessLogOrderClause(filter.SortBy, filter.SortOrder))
@@ -69,6 +69,7 @@ func scanNodeAccessLogRows(rows driver.Rows) ([]analyticsmodel.NodeAccessLog, er
 			&item.Host,
 			&item.Path,
 			&item.UserAgent,
+			&item.CacheStatus,
 			&item.StatusCode,
 			&item.BytesSent,
 			&item.RequestLength,