[Bug]: ShellCommandTool支持传入字符集，解决Windows下读取stdout/stderr乱码问题

[liwenshen2000]

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Describe the bug
ShellCommandTool默认使用UTF-8读取stdout/stderr，windows下会导致读取到的中文乱码。

agentscope-java/agentscope-core/src/main/java/io/agentscope/core/tool/coding/ShellCommandTool.java

Line 660 in aa62e7c

new InputStreamReader(inputStream, StandardCharsets.UTF_8))) {

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Expected behavior
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Error messages
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Environment (please complete the following information):

• AgentScope-Java Version: 1.0.10
• Java Version: 25
• OS: windows

Additional context
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