feat: support shorter string value for output.distPath

[chenjiahan]

Summary

This PR adds support for using a string value for output.distPath as a shorthand for output.distPath.root, since I noticed that in many cases, users only need to custom the root path — and using a string feels more intuitive in such scenarios.

export default {
  output: {
    distPath: 'dist-custom',
  },
};

Checklist

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

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[Copilot]

Pull Request Overview

This PR adds support for using a string value for output.distPath as a shorthand for output.distPath.root, making the configuration more intuitive when users only need to customize the root path.

Key changes:

• Updated type definitions to allow string values for distPath
• Added normalization logic to convert string values to object form
• Updated documentation with examples and version history

Reviewed Changes

Copilot reviewed 47 out of 47 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
packages/core/src/types/config.ts	Updated type definition to allow string or object for distPath
packages/core/src/defaultConfig.ts	Added normalizeConfigStructure function to handle string distPath conversion
packages/core/src/provider/initConfigs.ts	Updated to use new normalization function
packages/core/src/createContext.ts	Simplified getAbsoluteDistPath function signature
website/docs/en/config/output/dist-path.mdx	Added documentation for string type support
website/docs/zh/config/output/dist-path.mdx	Added Chinese documentation for string type support
e2e/cases/assets/custom-dist-path-string/*	New test case for string distPath functionality
Various e2e test files	Updated test configurations to use new string syntax

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