Merge pull request #1739 from QwenLM/feat/add-source-in-download-url

docs: Update Linux/Mac installation commands in README

Author: pomelo-nwu

README.md

@@ -36,7 +36,7 @@ Qwen Code is an open-source AI agent for the terminal, optimized for [Qwen3-Code
 #### Linux / macOS
 
 ```bash
-eval "$(curl -fsSL https://qwen-code-assets.oss-cn-hangzhou.aliyuncs.com/installation/install-qwen.sh)"
+curl -fsSL https://qwen-code-assets.oss-cn-hangzhou.aliyuncs.com/installation/install-qwen.sh | bash
 ```
 
 #### Windows (Run as Administrator CMD)