fix: use output.assetPrefix in none mode

[chenjiahan]

Summary

Updated getPublicPathto use isDev instead of isProd for determining the asset prefix, ensuring output.assetPrefix is used in production and none modes.

Based on the semantics and usage of the existing configuration, output.assetPrefix is ​​conceptually closer to configuring the asset path of none mode. This means that if users build in none mode, they should be able to use output.assetPrefix to specify the asset prefix.

Related Links

• [Bug]: assetPrefix fails when using an .env file to customize NODE_ENV #5351

Checklist

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

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[Copilot]

Pull Request Overview

This PR updates both documentation and code to ensure that output.assetPrefix is applied in production and none modes by switching the logic from an isProd check to an isDev check.

• Updated docs in both Chinese and English to reflect the supported modes.
• Changed the public path logic in packages/core/src/plugins/output.ts to use the isDev flag.
• Added a new end-to-end test to validate output.assetPrefix behavior in none mode.

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
website/docs/zh/config/output/asset-prefix.mdx	Updated mode description to clarify production and none modes usage.
website/docs/zh/config/mode.mdx	Updated to reference correct assetPrefix options for each mode.
website/docs/zh/config/dev/asset-prefix.mdx	Modified to reflect updated mode clarifications.
website/docs/en/config/output/asset-prefix.mdx	Updated mode description and code examples in TypeScript.
website/docs/en/config/mode.mdx	Updated to reference correct assetPrefix options for each mode.
website/docs/en/config/dev/asset-prefix.mdx	Modified to reflect updated mode clarifications using TypeScript.
packages/core/src/plugins/output.ts	Changed public path logic from using isProd to isDev.
e2e/cases/assets/asset-prefix/index.test.ts	Added test verifying that output.assetPrefix is used in none mode.

Comments suppressed due to low confidence (1)

packages/core/src/plugins/output.ts:30

• [nitpick] The parameter 'isDev' is used to decide whether to use output.assetPrefix by negating it. Consider renaming it (or adding a clarifying comment) to better reflect that the condition applies to both production and none modes.

if (!isDev) {