chore: TypeScript 5.9 → 6.0 마이그레이션

[chanwoo7]

배경

이슈 #60의 TypeScript 메이저 마이그레이션입니다.
보류 사유였던 TS5011(출력 레이아웃 기준 디렉터리 명시 요구)은 빌드 설정에 rootDir를 명시하는 것으로 해소됩니다.
타입 오류는 전무해서(strict 강화 영향 없음) 실제 조치는 빌드 설정 명시뿐이었습니다.

변경점

• typescript ^5.7.3 → ^6.0.3.
• typescript-eslint ^8.59.3 → ^8.67.0 (peer가 TS <6.1을 지원하는 버전).
• tsconfig.build.json에 rootDir: "./src" 명시.
  기존 공통 소스 디렉터리와 동일한 값이라 dist 산출 구조는 변하지 않습니다(dist/main.js 위치 확인).
• 빌드 부산물 *.tsbuildinfo gitignore 추가.

검증

• yarn build(nest build) 통과 및 dist 레이아웃 불변 확인.
• yarn validate 전체 통과 (lint + tsc + dto:check + arch:check + 커버리지 게이트, 1574 tests / 184 suites).

Closes #60

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[github-actions]

🩺 NestJS Doctor — 89/100 (Good)

진단 279건 (error 0).

Category	error	warning	info
architecture	0	0	13
correctness	0	126	0
performance	0	24	17
schema	0	0	86
security	0	13	0

architecture / security 상위 항목

• info architecture/architecture/no-barrel-export-internals: Barrel file re-exports internal type 'IAuditLogRepository'.
• warning security/security/no-exposed-env-vars: Direct 'process.env.NODE_ENV' access in 'AuthController'. Use ConfigService instead.
• warning security/security/require-guards-on-endpoints: Endpoint 'start' has no @UseGuards() at class or method level.
• warning security/security/require-guards-on-endpoints: Endpoint 'callback' has no @UseGuards() at class or method level.
• warning security/security/require-guards-on-endpoints: Endpoint 'refresh' has no @UseGuards() at class or method level.
• warning security/security/require-guards-on-endpoints: Endpoint 'logout' has no @UseGuards() at class or method level.
• warning security/security/require-guards-on-endpoints: Endpoint 'sellerLogin' has no @UseGuards() at class or method level.
• warning security/security/require-guards-on-endpoints: Endpoint 'sellerRefresh' has no @UseGuards() at class or method level.
• warning security/security/require-guards-on-endpoints: Endpoint 'sellerLogout' has no @UseGuards() at class or method level.
• warning security/security/require-guards-on-endpoints: Endpoint 'devIssueToken' has no @UseGuards() at class or method level.
• info architecture/architecture/no-barrel-export-internals: Barrel file re-exports internal module '@/features/conversation/repositories/conversation.repository'.
• info architecture/architecture/no-barrel-export-internals: Barrel file re-exports internal type 'ConversationRepository'.
• info architecture/architecture/no-barrel-export-internals: Barrel file re-exports internal module '@/features/order/repositories/order.repository'.
• info architecture/architecture/no-barrel-export-internals: Barrel file re-exports internal type 'OrderRepository'.
• info architecture/architecture/no-barrel-export-internals: Barrel file re-exports internal module '@/features/product/repositories/product.repository'.

오탐 포함 가능 · 기준 docs/guide/architecture-conventions.md

[github-actions]

🧹 knip — dead-code 리포트

요약 항목 없음

전체 리포트

(knip 출력 없음 — 이슈 0이거나 실행 실패)

청소 후보(오탐 가능) · 기준 docs/guide/architecture-conventions.md

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟢	Statements	97.61%	4772/4889
🟢	Branches	93.96%	1928/2052
🟢	Functions	95.99%	933/972
🟢	Lines	98.21%	4339/4418

Test suite run success

1574 tests passing in 184 suites.

Report generated by 🧪jest coverage report action from 1866d69