docs: sealos create support for environment variable based template rendering

[LZiHaN]

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Summary

📝🆕🌐

This pull request adds and documents a new option for the sealos create command that allows specifying environment variables for cluster creation. The changes affect both the English and Chinese documentation files in docs/4.0.

Oh, we're the crew of the sealos ship, and we sail the code sea
We document our commands with care, for every user to see
We added a new option today, to set environment vars
So heave away, me hearties, heave away on sealos create

Walkthrough

• Add a new option -e, --env=[] to the sealos create command, which allows users to specify environment variables used during the rendering of template files (link, link)
• Modify the example command for the sealos create command in the docs/4.0/docs/self-hosting/lifecycle-management/reference/sealos/commands/create.md and docs/4.0/i18n/zh-Hans/self-hosting/lifecycle-management/reference/sealos/commands/create.md files, adding the -e registryPort=8443 option and clarifying that the cluster is not actually run by the command (link, link)
• Update the wording of the last paragraph in the example section of the sealos create command documentation, improving the clarity and accuracy of the information (link, link)

refer to #3774

Supporting documentation:
https://sealos.io/docs/self-hosting/lifecycle-management/operations/build-image/build-image-go_template
https://sealos.io/docs/self-hosting/lifecycle-management/advanced-guide/template-function
https://sealos.io/docs/self-hosting/lifecycle-management/reference/sealos/app-cluster-image

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