fix(skill): support custom charset for zip extraction

[fang-tech]

AgentScope-Java Version

1.0.11

Description

• add Charset overloads to SkillUtil.createFromZip(...) for byte arrays, paths, and input streams
• use the provided charset to decode zip entry names and text content during extraction
• document that this option is intended for non-UTF-8 zip packages that may fail with malformed input during entry decoding

Checklist

Please check the following items before code is ready to be reviewed.

• Code has been formatted with mvn spotless:apply
• All tests are passing (mvn test)
• Javadoc comments are complete and follow project conventions
• Related documentation has been updated (e.g. links, examples, etc.)
• Code is ready for review

[Copilot]

Pull request overview

Adds support for non-UTF-8 zip skill packages by allowing callers to specify the Charset used when decoding zip entry names and extracted text content.

Changes:

• Added Charset overloads for SkillUtil.createFromZip(...) across byte arrays, paths, and input streams.
• Updated zip extraction to use the provided charset for entry-name decoding and text decoding.
• Added a unit test that validates extraction using a GBK-encoded zip.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 6 comments.

File	Description
agentscope-core/src/main/java/io/agentscope/core/skill/util/SkillUtil.java	Adds charset-aware createFromZip overloads and uses charset for ZipInputStream + content decoding.
agentscope-core/src/test/java/io/agentscope/core/skill/SkillUtilTest.java	Adds a GBK-based zip extraction test and charset-aware zip test helper.

[codecov]

Codecov Report

❌ Patch coverage is 69.23077% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
.../java/io/agentscope/core/skill/util/SkillUtil.java	69.23%	3 Missing and 1 partial ⚠️

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