feat: define import.meta.env.BASE_URL

[chenjiahan]

Summary

Define the import.meta.env.BASE_URL environment variable.

Both import.meta.env.BASE_URL and process.env.BASE_URL should be supported, as many modern projects prefer to use import.meta.env.

Related Links

#3542

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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