refactor: Node.js Subpath Importsでモジュール境界を明確化

[KinjiKawaguchi]

Why

• モジュール境界が曖昧で、内部実装詳細が公開されていた
• 相対パス (../../../domain) が可読性を下げていた

What

• Node.js Subpath Imports (#domain, #application, #infrastructure) を導入
• 全68ファイルのインポートをサブパスインポートに変更
• infrastructure/drizzle: schema.ts, client.ts の公開を停止（内部詳細として隠蔽）
• moduleResolution を node16 に変更

Before

import { Member } from "../../../domain";
import { EventNotFoundException } from "../../exceptions";

After

import { Member } from "#domain";
import { EventNotFoundException } from "#application/exceptions";

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR refactors the module structure to clarify boundaries and hide internal implementation details, making the codebase more maintainable and better encapsulated.

Changes:

• Removed unused @/* path alias from TypeScript configuration
• Hid internal database implementation details (schema and client) from the infrastructure/drizzle module's public API
• Unified domain module imports to consistently use index.ts barrel exports

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
tsconfig.json	Removed unused @/* path alias configuration including baseUrl and paths
src/infrastructure/drizzle/index.ts	Changed from wildcard exports to explicit repository-only exports, hiding schema.ts and client.ts
src/domain/aggregates/member/Member.ts	Updated imports to use barrel exports from index.ts for exceptions and value-objects modules

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