docs: point readers at the archived minio branch

Someone arriving at main after the rename has one question the README did not
answer: where did the MinIO-named builds go. Both READMEs now say it directly —
the archived minio branch and the releases up to RELEASE.2026-08-04T00-00-00Z
hold the artifacts maintained under the original identity, and those assets and
the docker.io/pgsty/minio image stay published and unmodified.

The note also records the rename itself with its date, and repeats the one fact
that determines whether an operator has any work to do: only product and
artifact names changed. MINIO_* variables, minio_* metrics, x-minio-* headers,
/minio/* routes and the on-disk format are the same.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

README.md

@@ -28,6 +28,9 @@
 > [!IMPORTANT]
 > Silo is an independent, community-maintained fork of the open-source MinIO server, published by [Pigsty](https://pigsty.io) from [`pgsty/silo`](https://github.com/pgsty/silo). It is not affiliated with, endorsed by, or sponsored by MinIO, Inc. “MinIO” is used only to identify the upstream project and compatibility lineage.
 
+> [!NOTE]
+> This repository was renamed from `pgsty/minio` to `pgsty/silo`, and its default branch from `master` to `main`, on 2026-08-06. If you need the artifacts maintained under the original MinIO identity, they are on the archived [`minio`](https://github.com/pgsty/silo/tree/minio) branch and in the releases up to [`RELEASE.2026-08-04T00-00-00Z`](https://github.com/pgsty/silo/releases/tag/RELEASE.2026-08-04T00-00-00Z); those assets and the `docker.io/pgsty/minio` image stay published and unmodified. The rename changed product and artifact names only — `MINIO_*` variables, `minio_*` metrics, `x-minio-*` headers, `/minio/*` routes, and the on-disk format are unchanged.
+
 ## Overview
 
 Silo maintains one downstream release line derived from the open-source MinIO server. It provides maintained builds and release artifacts for existing MinIO-compatible deployments after upstream community distribution ended. Pigsty uses Silo for object storage, including as an optional PostgreSQL backup repository.

README_ZH.md

@@ -28,6 +28,9 @@
 > [!IMPORTANT]
 > Silo 是由 [Pigsty](https://pigsty.cc) 独立维护、从 [`pgsty/silo`](https://github.com/pgsty/silo) 发布的开源 MinIO 社区分支。本项目与 MinIO, Inc. 不存在隶属、背书或赞助关系；文中使用 “MinIO” 仅用于说明上游项目及兼容谱系。
 
+> [!NOTE]
+> 2026-08-06，本仓库由 `pgsty/minio` 更名为 `pgsty/silo`，默认分支由 `master` 更名为 `main`。如果你需要以原本 MinIO 形态维持的归档构件，它们位于归档的 [`minio`](https://github.com/pgsty/silo/tree/minio) 分支，以及截止到 [`RELEASE.2026-08-04T00-00-00Z`](https://github.com/pgsty/silo/releases/tag/RELEASE.2026-08-04T00-00-00Z) 的历次发布中；这些资产与 `docker.io/pgsty/minio` 镜像保持已发布状态且不做改动。本次更名只改变产品与交付物名称 —— `MINIO_*` 变量、`minio_*` 指标、`x-minio-*` 头、`/minio/*` 路由与磁盘格式均保持不变。
+
 ## 概述
 
 Silo 维护一条源自开源 MinIO 服务端的下游版本线，为上游停止社区发行后仍在运行 MinIO 兼容部署的用户提供持续构建与发行产物。