Update README.md

[zj1123581321]

增加说明，代理的 openai 地址需要以 "/v1" 结尾。

Summary by Sourcery

Documentation:

• Clarify in the README.md that the OpenAI endpoint URL must end with '/v1'.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR updates the README.md file to clarify that the OpenAI API endpoint configuration must end with "/v1" in the environment variable settings.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Updated environment variable documentation for OpenAI API endpoint	Added clarification that the FC_OPENAI_ENDPOINT value must end with '/v1'	README.md

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[sourcery-ai]

Hey @zj1123581321 - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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