fix: 型定義ファイル内のパスエイリアスを相対パスに変換

[KinjiKawaguchi]

Summary

• tsupで生成される.d.tsファイル内の#domain等のsubpath importsがパッケージ利用者側で解決できない問題を修正
• tsc-aliasを追加し、ビルド後にパスエイリアスを相対パスに変換するように変更
• バージョンを2.1.2に更新

背景

パッケージ利用者がmoduleResolution: "bundler"などを設定しても、.d.tsファイル内の#domainなどのsubpath importsはTypeScriptで解決できず、型がanyになる問題があった。

Test plan

• its-discordでリンクして型チェック・ビルドが通ることを確認済み

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR updates the build pipeline so that .d.ts files no longer contain unresolved subpath imports like #domain, by post-processing the build output with tsc-alias, and bumps the package version accordingly.

Changes:

• Bump package version from 2.1.1 to 2.1.2.
• Update the build script to run tsup and then tsc-alias against dist using the existing tsconfig.json path aliases.
• Add tsc-alias (and its dependency graph in package-lock.json) as a dev dependency and reformat the files field for consistency.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
package.json	Bumps version, adds tsc-alias as a dev dependency, and updates the build script to rewrite path aliases in the emitted dist .d.ts files.
package-lock.json	Regenerates the lockfile to reflect the new version and the added tsc-alias package and its transitive dependencies.

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