add cn docs translated by gpt 5.5

[buliugu]

Based on the English version, a Simplified Chinese version was generated throughout using GPT-5.5 translation. The image resources have not been replaced.

[gemini-code-assist]

Code Review

This pull request adds several chatflow and agent configuration JSON files, along with an SVG logo, to the Simplified Chinese translation assets directory (cn/.gitbook/assets/). However, a critical security issue was identified regarding a hardcoded OpenAI API key in the OpenAPI Toolkit with ToolAgent Chatflow file. Additionally, the newly added JSON files are entirely in English and lack the expected Chinese translations.

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[gemini-code-assist]

A hardcoded OpenAI API key (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) was found in the headers of the OpenAPI Toolkit node. This key must be revoked immediately to prevent unauthorized usage and billing charges. Please replace it with a placeholder or use environment variables/credentials to manage sensitive keys.

Suggested change

	"headers": "{\"Authorization\":\"Bearer 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\"}",
	"headers": "{\"Authorization\":\"Bearer YOUR_OPENAI_API_KEY\"}",

[gemini-code-assist]

The pull request title and description state that these files are Simplified Chinese translations of the English documentation. However, the newly added JSON files under the cn/ directory (such as cn/.gitbook/assets/Agentic RAG V2.json) are entirely in English and contain no translated Chinese text. Please ensure that the translated versions of these files are committed instead of the original English ones.