feat(secrets-mcp): 审计页、audit_log user_id、OAuth 登录与仪表盘 footer

- audit_log 增加 user_id；业务写审计透传 user_id
- Web /audit 与侧边栏；Dashboard 版本 footer 贴底（margin-top: auto）
- 停止 API Key 鉴权成功写入登录审计
- 文档、CI、release-check 配套更新

Made-with: Cursor

crates/secrets-core/src/service/delete.rs

@@ -137,7 +137,7 @@ async fn delete_one(
     };
 
     snapshot_and_delete(&mut tx, namespace, kind, name, &row, user_id).await?;
-    crate::audit::log_tx(&mut tx, "delete", namespace, kind, name, json!({})).await;
+    crate::audit::log_tx(&mut tx, user_id, "delete", namespace, kind, name, json!({})).await;
     tx.commit().await?;
 
     Ok(DeleteResult {
@@ -240,6 +240,7 @@ async fn delete_bulk(
         .await?;
         crate::audit::log_tx(
             &mut tx,
+            user_id,
             "delete",
             namespace,
             &row.kind,