fix(core): preserve multimodal content parts in DashScope tool result…

[zhsnddn]

AgentScope-Java Version

1.0.12-SNAPSHOT

Description

fix issue#1153
Problem reproduction:
From the image, we can see that the current processing method converts all modalities into text format and then concatenates them. This causes an issue where image URLs cannot be extracted correctly from the same modality.

Comparison with the OpenAI approach:
In the OpenAI approach, a modality check is added before extraction. As shown in the image, different types can be separated, which makes it possible to extract image URLs.

Implementation and idea:
The implementation borrows from OpenAI’s approach by adding modality detection and separation before processing. Due to inconsistencies between the DTO formats and OpenAI, the final output is structured according to the DashScopeMessage DTO format.

Edge Cases Handled：

Due to structural adjustments, the input format of Tool result has been modified in DashScopeChatFormatterGroundTruthTest and DashScopeMultiAgentFormatterGroundTruthTest.

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

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

❌ Patch coverage is 64.86486% with 13 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...formatter/dashscope/DashScopeMessageConverter.java	64.86%	10 Missing and 3 partials ⚠️

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