Update runOutput.ts

[Panyer]

fix:修复图表无法在聊天窗口回显

[gru-agent]

TestGru Assignment

Summary

Link	CommitId	Status	Reason
Detail	4f56940	🚫 Skipped	No files need to be tested {"packages/service/core/workflow/dispatch/plugin/runOutput.ts":"File path does not match include patterns."}

History Assignment

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[cla-assistant]

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[github-actions]

Preview sandbox Image:

registry.cn-hangzhou.aliyuncs.com/fastgpt/fastgpt-pr:fatsgpt_sandbox_4f5694016515355b74e9fe2bf385bcd54bb4fb66

[github-actions]

Preview mcp_server Image:

registry.cn-hangzhou.aliyuncs.com/fastgpt/fastgpt-pr:fatsgpt_mcp_server_4f5694016515355b74e9fe2bf385bcd54bb4fb66

[github-actions]

Preview fastgpt Image:

registry.cn-hangzhou.aliyuncs.com/fastgpt/fastgpt-pr:fatsgpt_4f5694016515355b74e9fe2bf385bcd54bb4fb66

[c121914yu]

base64 应该在接口里处理好，或者增加一个 base64 转url 的系统工具。