refactor db audit log

TOC-tidb-cloud-essential.md

@@ -266,6 +266,7 @@
     - [TLS Connections to TiDB Cloud](/tidb-cloud/secure-connections-to-serverless-clusters.md)
   - Audit Management
     - [Console Audit Logging](/tidb-cloud/tidb-cloud-console-auditing.md)
+    - [Database Audit Logging](/tidb-cloud/serverless-database-audit-logging.md)
 - Billing
   - [Invoices](/tidb-cloud/tidb-cloud-billing.md#invoices)
   - [Billing Details](/tidb-cloud/tidb-cloud-billing.md#billing-details)
@@ -605,6 +606,18 @@
       - [delete](/tidb-cloud/ticloud-serverless-authorized-network-delete.md)
       - [list](/tidb-cloud/ticloud-serverless-authorized-network-list.md)
       - [update](/tidb-cloud/ticloud-serverless-authorized-network-update.md)
+    - audit-log
+      - config
+        - [update](/tidb-cloud/ticloud-serverless-audit-log-config-update.md)
+        - [describe](/tidb-cloud/ticloud-serverless-audit-log-config-describe.md)
+      - filter-rule
+        - [create](/tidb-cloud/ticloud-serverless-audit-log-filter-rule-create.md)
+        - [delete](/tidb-cloud/ticloud-serverless-audit-log-filter-rule-delete.md)
+        - [describe](/tidb-cloud/ticloud-serverless-audit-log-filter-rule-describe.md)
+        - [list](/tidb-cloud/ticloud-serverless-audit-log-filter-rule-list.md)
+        - [update](/tidb-cloud/ticloud-serverless-audit-log-filter-rule-update.md)
+        - [template](/tidb-cloud/ticloud-serverless-audit-log-filter-rule-template.md)
+      - [download](/tidb-cloud/ticloud-serverless-audit-log-download.md)
   - [ai](/tidb-cloud/ticloud-ai.md)
   - [completion](/tidb-cloud/ticloud-completion.md)
   - config