chore(build): prebundle deps in rsbuild-plugin-dts

[Timeless0911]

Summary

Prebundle deps in rsbuild-plugin-dts to reduce deps count.

Related Links

Checklist

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

[Copilot]

Pull Request Overview

This PR prebundles dependencies (magic-string, picocolors, tinyglobby, and tsconfig-paths) in the plugin-dts package to optimize bundle size and performance. The prebundling approach moves these dependencies from runtime to build-time bundling.

Key changes:

• Configures prebundling setup with external dependency mapping
• Updates import strategy for tsconfig-paths to use namespace import
• Moves dependencies from runtime to devDependencies

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/plugin-dts/tsconfig.json	Adds path mappings for prebundled dependencies
packages/plugin-dts/src/utils.ts	Changes tsconfig-paths import to namespace import for prebundling compatibility
packages/plugin-dts/rslib.config.ts	Configures external mappings for prebundled dependencies
packages/plugin-dts/prebundle.config.mjs	Adds prebundle configuration with dependency list and picocolors type fix
packages/plugin-dts/package.json	Moves dependencies to devDependencies and adds prebundle script
packages/core/rslib.config.ts	Adds comment for external dependencies configuration

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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