docs: add IvorySQL community Harbor registry tips for Chinese users

Add concise TIP notes in Docker-related sections pointing to the new
community Harbor mirror (https://registry.highgo.com/) so users in China
can pull images faster. Applied symmetrically across EN/ and CN/ in the
Quick Start, Installation, Docker & Podman deployment, and Operator
image-preload pages.

Author: jiaoshuntian

CN/modules/ROOT/pages/master/cloud_platform/ivorysql_cloud_installation.adoc

@@ -364,6 +364,8 @@ https://github.com/IvorySQL/ivory-operator/tree/IVYO_REL_5_STABLE[https://github
 
 如果服务器可以直接访问到docker hub,可以跳过该章节。否则需要在所有的K8S集群节点提前load 如下docker镜像
 
+TIP: 国内用户可使用 IvorySQL 社区的 Harbor 镜像服务（https://registry.highgo.com/[https://registry.highgo.com/]）拉取以下镜像，将 `docker.io/` 替换为 `registry.highgo.com/` 即可。
+
 [literal]
 ----
 docker.io/ivorysql/pgadmin:ubi8-9.9-5.0-1

CN/modules/ROOT/pages/master/containerization/docker_podman_deployment.adoc

@@ -4,6 +4,11 @@
 
 = Docker & Podman 部署IvorySQL
 
+[TIP]
+====
+除 Docker Hub 外，IvorySQL 社区还为国内用户提供 Harbor 镜像服务：https://registry.highgo.com/[https://registry.highgo.com/]。将本章节中的镜像地址前缀替换为 `registry.highgo.com/` 即可使用，例如 `registry.highgo.com/ivorysql/ivorysql:5.0-ubi8`。
+====
+
 == docker方式运行
 
 ** 从Docker Hub上获取IvorySQL镜像

CN/modules/ROOT/pages/master/getting-started/quick_start.adoc

@@ -116,6 +116,8 @@ ivorysql  3238  1551  0 20:35 pts/0    00:00:00 grep --color=auto postgres
 $ docker pull ivorysql/ivorysql:5.0-ubi8
 ```
 
+TIP: 国内用户可使用 IvorySQL 社区的 Harbor 镜像服务（https://registry.highgo.com/[https://registry.highgo.com/]）加速拉取，例如：`docker pull registry.highgo.com/ivorysql/ivorysql:5.0-ubi8`。
+
 ** 运行IvorySQL
 ```
 $ docker run --name ivorysql -p 5434:5432 -e IVORYSQL_PASSWORD=your_password -d ivorysql/ivorysql:5.0-ubi8

CN/modules/ROOT/pages/master/installation_guide.adoc

@@ -43,6 +43,8 @@ $ sudo dnf install -y ivorysql5-5.0
 $ docker pull ivorysql/ivorysql:5.0-ubi8
 ```
 
+TIP: 国内用户也可使用 IvorySQL 社区的 Harbor 镜像服务（https://registry.highgo.com/[https://registry.highgo.com/]）加速拉取，将上述地址替换为 `registry.highgo.com/ivorysql/ivorysql:5.0-ubi8` 即可。
+
 ** 运行IvorySQL
 ```
 $ docker run --name ivorysql -p 5434:5432 -e IVORYSQL_PASSWORD=your_password -d ivorysql/ivorysql:5.0-ubi8

EN/modules/ROOT/pages/master/cloud_platform/ivorysql_cloud_installation.adoc

@@ -363,6 +363,8 @@ https://github.com/IvorySQL/ivory-operator/tree/IVYO_REL_5_STABLE[https://github
 
 If your servers have direct access to Docker Hub, you can skip this step. Otherwise, preload the following images on every node in the Kubernetes cluster.
 
+TIP: Users in China can pull the following images from the IvorySQL community Harbor registry (https://registry.highgo.com/[https://registry.highgo.com/]) by replacing the `docker.io/` prefix with `registry.highgo.com/`.
+
 [literal]
 ----
 docker.io/ivorysql/pgadmin:ubi8-9.9-5.0-1

EN/modules/ROOT/pages/master/containerization/docker_podman_deployment.adoc

@@ -4,6 +4,11 @@
 
 = Docker & Podman deployment IvorySQL
 
+[TIP]
+====
+In addition to Docker Hub, the IvorySQL community also provides a Harbor registry for users in China: https://registry.highgo.com/[https://registry.highgo.com/]. Replace the image prefix used in this chapter with `registry.highgo.com/`, e.g. `registry.highgo.com/ivorysql/ivorysql:5.0-ubi8`.
+====
+
 == Running IvorySQL in docker
 
 ** Get IvorySQL image from Docker Hub

EN/modules/ROOT/pages/master/getting-started/quick_start.adoc

@@ -111,6 +111,8 @@ ivorysql  3238  1551  0 20:35 pts/0    00:00:00 grep --color=auto postgres
 $ docker pull ivorysql/ivorysql:5.0-ubi8
 ```
 
+TIP: Users in China can also pull from the IvorySQL community Harbor registry (https://registry.highgo.com/[https://registry.highgo.com/]) for faster downloads, e.g. `docker pull registry.highgo.com/ivorysql/ivorysql:5.0-ubi8`.
+
 ** Running IvorySQL
 ```
 $ docker run --name ivorysql -p 5434:5432 -e IVORYSQL_PASSWORD=your_password -d ivorysql/ivorysql:5.0-ubi8

EN/modules/ROOT/pages/master/installation_guide.adoc

@@ -44,6 +44,8 @@ $ sudo dnf install -y ivorysql5-5.0
 $ docker pull ivorysql/ivorysql:5.0-ubi8
 ```
 
+TIP: Users in China can also pull from the IvorySQL community Harbor registry (https://registry.highgo.com/[https://registry.highgo.com/]) for faster downloads — replace the image reference above with `registry.highgo.com/ivorysql/ivorysql:5.0-ubi8`.
+
 ** Run IvorySQL
 ```
 $ docker run --name ivorysql -p 5434:5432 -e IVORYSQL_PASSWORD=your_password -d ivorysql/ivorysql:5.0-ubi8