Doc: executor manager updated docker version (#11946)

### What problem does this PR solve?

Add documentation for #11806.

### Type of change

- [x] Documentation Update

docs/guides/agent/agent_component_reference/code.mdx

@@ -23,6 +23,10 @@ We use gVisor to isolate code execution from the host system. Please follow [the
 
 RAGFlow Sandbox is a secure, pluggable code execution backend. It serves as the code executor for the **Code** component. Please follow the [instructions here](https://github.com/infiniflow/ragflow/tree/main/sandbox) to install RAGFlow Sandbox.
 
+:::note Docker client version
+The executor manager image now bundles Docker CLI `29.1.0` (API 1.44+). Older images shipped Docker 24.x and will fail against newer Docker daemons with `client version 1.43 is too old`. Pull the latest `infiniflow/sandbox-executor-manager:latest` or rebuild `./sandbox/executor_manager` if you encounter this error.
+:::
+
 :::tip NOTE
 If your RAGFlow Sandbox is not working, please be sure to consult the [Troubleshooting](#troubleshooting) section in this document. We assure you that it addresses 99.99% of the issues!
 :::
@@ -122,6 +126,22 @@ docker pull infiniflow/sandbox-base-nodejs:latest
 docker pull infiniflow/sandbox-base-python:latest
 ```
 
+### `docker: Error response from daemon: client version 1.43 is too old. Minimum supported API version is 1.44`
+
+**Root cause**
+
+The executor manager image you are running includes Docker CLI 24.x (API 1.43) while the host Docker daemon now requires API 1.44+ (e.g., Docker 25+ / 29.x).
+
+**Solution**
+
+Pull the refreshed image or rebuild locally so the embedded Docker client is new enough:
+
+```bash
+docker pull infiniflow/sandbox-executor-manager:latest
+# or
+docker build -t sandbox-executor-manager:latest ./sandbox/executor_manager
+```
+
 ### `HTTPConnectionPool(host='none', port=9385): Max retries exceeded.`
 
 **Root cause**  

docs/guides/agent/sandbox_quickstart.md

@@ -23,11 +23,13 @@ The architecture consists of isolated Docker base images for each supported lang
 
 - Linux distribution compatible with gVisor.
 - gVisor installed and configured.
-- Docker version 24.0.0 or higher.
+- Docker version 25.0 or higher (API 1.44+). The executor manager image now ships Docker CLI `29.1.0` to stay compatible with newer Docker daemons.
 - Docker Compose version 2.26.1 or higher (similar to RAGFlow requirements).
 - uv package and project manager installed.
 - (Optional) GNU Make for simplified command-line management.
 
+> **Note:** If you see `client version 1.43 is too old. Minimum supported API version is 1.44`, pull the latest `infiniflow/sandbox-executor-manager:latest` from Docker Hub (or rebuild `./sandbox/executor_manager`). Older images embedded Docker 24.x, which cannot talk to upgraded Docker daemons.
+
 ## Build Docker base images
 
 The sandbox uses isolated base images for secure containerised execution environments.

sandbox/README.md

@@ -24,7 +24,7 @@ A secure, pluggable code execution backend for RAGFlow and beyond.
 
 - Linux distro compatible with gVisor
 - [gVisor](https://gvisor.dev/docs/user_guide/install/)
-- Docker >= `24.0.0`
+- Docker >= `25.0` (API 1.44+) — executor manager now bundles Docker CLI `29.1.0` to match newer daemons.
 - Docker Compose >= `v2.26.1` like [RAGFlow](https://github.com/infiniflow/ragflow)
 - [uv](https://docs.astral.sh/uv/) as package and project manager
 
@@ -34,6 +34,10 @@ A secure, pluggable code execution backend for RAGFlow and beyond.
 
 ---
 
+> ⚠️ **New Docker CLI requirement**
+>
+> If you see `client version 1.43 is too old. Minimum supported API version is 1.44`, pull the latest `infiniflow/sandbox-executor-manager:latest` (rebuilt with Docker CLI `29.1.0`) or rebuild `./sandbox/executor_manager` locally. Older images shipped Docker 24.x, which cannot talk to newer Docker daemons.
+
 ### 🐳 Build Docker Base Images
 
 We use isolated base images for secure containerized execution:
@@ -292,6 +296,22 @@ Follow this checklist to troubleshoot:
   127.0.0.1 es01 infinity mysql minio redis sandbox-executor-manager
   ```
 
+- [ ] **Are you running the latest executor manager image?**
+
+  **Common error:**
+
+  `docker: Error response from daemon: client version 1.43 is too old. Minimum supported API version is 1.44`
+
+  **Fix:**
+
+  Pull the refreshed image that bundles Docker CLI `29.1.0`, or rebuild locally:
+
+  ```bash
+  docker pull infiniflow/sandbox-executor-manager:latest
+  # or
+  docker build -t sandbox-executor-manager:latest ./sandbox/executor_manager
+  ```
+
 - [ ] **Have you enabled sandbox-related configurations in RAGFlow?**
 
   Double-check that all sandbox settings are correctly enabled in your RAGFlow configuration.