feat!: publish only esm output

[chenjiahan]

Summary

• Only build and publish the ESM bundle plus declaration files.
• Remove CJS-specific package entry fields so the published metadata matches the generated output.
• Validate the change with pnpm lint and pnpm build.

Related Links

• None

[Copilot]

Pull request overview

This PR updates the library build and package metadata to publish ESM-only output (plus .d.ts) and remove CommonJS-oriented entrypoints so package.json matches the generated artifacts.

Changes:

• Configure rslib to emit only an ESM build with TypeScript declarations.
• Update package.json exports to a single ESM entry and simplify the published files list.

Reviewed changes

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

File	Description
rslib.config.ts	Removes the CJS build target; keeps ESM + dts generation.
package.json	Adjusts exports and removes legacy entry fields to align with ESM-only publishing.

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