feat(flutter): 앱 로그인 · 토큰 갱신 · 모듈 라우터 기반을 만든다

앱 1단계의 바탕이다(계약 1절 "앱 로그인" — 서버는 다음 차례, 지금은 가짜 서버로 시험한다).

- 토큰: 리프레시 토큰은 보안 저장소에만, 액세스 토큰은 메모리에만. 첫 실행 표시가 없으면 남은 토큰을
  지우고, 안드로이드 백업을 끈다. 보안 저장소 일은 차례로 한다
- 인터셉터: 401 이면 갱신 한 번(동시 401 묶음) 뒤 다시 보내기, AUTH_010 은 me 를 다시 받아 그 단계로,
  미리 갱신 30초 전 · 만료는 응답 Date 로, 세션 세대가 바뀐 뒤의 응답은 조용히 버린다,
  비밀이 든 요청의 실패 예외는 본문 · Bearer 를 지운다
- 세션: 로그인 · 코드 · 새 비밀번호 · 2단계 켜기 단계의 상태와 늦은 결과 버리기(버린 로그인의 토큰은
  조용히 logout), 로그아웃은 메모리부터 비운다, 유예 응답이면 세션 끝 + 조용한 logout
- 모듈 틀: go_router StatefulShellRoute 와 아래 탭 막대 — 모듈 목록은 웹 app-modules.ts 와 짝,
  첫 판은 [메일 · 설정]. 모듈끼리 import 하지 않는다
- Riverpod 자동 다시 하기를 끈다, Pretendard 1.3.9(OFL), 확정 글자 크기, 시험 126건
- 판은 Flutter 3.41.9(Dart 3.11.5) — pubspec 의 sdk 하한과 lock 을 함께

리뷰 세 번 반영(AUTH_010 다시 보내기 · 늦은 응답 · 저장 실패 · 로그아웃 차례 · 비밀이 실린 객체 등).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

flutter/pubspec.yaml

@@ -1,92 +1,64 @@
 name: arasystem_app
 description: "ARA SYSTEM 그룹웨어 모바일 앱"
-# The following line prevents the package from being accidentally published to
-# pub.dev using `flutter pub publish`. This is preferred for private packages.
-publish_to: 'none' # Remove this line if you wish to publish to pub.dev
+# pub.dev 에 올리지 않는 사내 앱이다.
+publish_to: 'none'
 
-# The following defines the version and build number for your application.
-# A version number is three numbers separated by dots, like 1.2.43
-# followed by an optional build number separated by a +.
-# Both the version and the builder number may be overridden in flutter
-# build by specifying --build-name and --build-number, respectively.
-# In Android, build-name is used as versionName while build-number used as versionCode.
-# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
-# In iOS, build-name is used as CFBundleShortVersionString while build-number is used as CFBundleVersion.
-# Read more about iOS versioning at
-# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
-# In Windows, build-name is used as the major, minor, and patch parts
-# of the product and file versions while build-number is used as the build suffix.
+# 앱 판 — build-name(1.0.0)은 Android versionName · iOS CFBundleShortVersionString,
+# build-number(+1)는 Android versionCode · iOS CFBundleVersion 이 된다.
+# 서버에 보내는 User-Agent 의 판(ARASYSTEM-App/<판>)도 build-name 이다 (core/api/user_agent.dart).
 version: 1.0.0+1
 
 environment:
-  sdk: ^3.11.1
+  # Flutter 3.41.9 의 Dart — 판 고정은 .claude/skills/flutter/SKILL.md "Flutter 판"
+  sdk: ^3.11.5
 
-# Dependencies specify other packages that your package needs in order to work.
-# To automatically upgrade your package dependencies to the latest versions
-# consider running `flutter pub upgrade --major-versions`. Alternatively,
-# dependencies can be manually updated by changing the version numbers below to
-# the latest version available on pub.dev. To see which dependencies have newer
-# versions available, run `flutter pub outdated`.
+# 새 패키지는 pub.dev 배포 뒤 2주가 지난 판만 고른다 (보안 규칙 "의존성"의 2주 규칙과 같다).
 dependencies:
   flutter:
     sdk: flutter
+  # 한국어 시스템 문구(복사 · 붙여 넣기 메뉴 · 날짜 고르기) — locale: ko
+  flutter_localizations:
+    sdk: flutter
 
-  # The following adds the Cupertino Icons font to your application.
-  # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.8
+  # 기기 정보(Android 판 · 기종) — User-Agent 만들기
+  device_info_plus: ^13.3.0
   dio: ^5.9.2
   flutter_dotenv: ^5.2.1
   flutter_riverpod: ^3.3.1
   flutter_secure_storage: ^10.0.0
+  # 화면 이동 — redirect 하나가 세션 상태로 화면을 고른다 (core/router/)
+  go_router: ^17.5.0
+  # 날짜 · 숫자 형식 — flutter_localizations 가 이 판으로 고정한다
+  intl: 0.20.2
+  # 앱 판 — User-Agent 만들기
+  package_info_plus: ^10.2.2
+  # 첫 실행 표시 하나만 둔다 — 토큰은 여기에 두지 않는다 (core/storage/first_run_marker.dart)
+  shared_preferences: ^2.5.6
 
 dev_dependencies:
   flutter_test:
     sdk: flutter
-
-  # The "flutter_lints" package below contains a set of recommended lints to
-  # encourage good coding practices. The lint set provided by the package is
-  # activated in the `analysis_options.yaml` file located at the root of your
-  # package. See that file for information about deactivating specific lint
-  # rules and activating additional ones.
   flutter_lints: ^6.0.0
 
-# For information on the generic Dart part of this file, see the
-# following page: https://dart.dev/tools/pub/pubspec
-
-# The following section is specific to Flutter packages.
 flutter:
-
-  # The following line ensures that the Material Icons font is
-  # included with your application, so that you can use the icons in
-  # the material Icons class.
   uses-material-design: true
 
-  # 런타임 환경변수 — flutter_dotenv 로 로드
   assets:
+    # 런타임 환경변수 — flutter_dotenv 로 읽는다 (API_URL 만 — 앱 안에 그대로 들어가니 비밀은 넣지 않는다)
     - .env
+    # 글꼴 라이선스 — 설정의 [오픈소스 라이선스]에 보인다 (core/theme/app_fonts.dart)
+    - assets/licenses/pretendard-ofl.txt
 
-  # An image asset can refer to one or more resolution-specific "variants", see
-  # https://flutter.dev/to/resolution-aware-images
-
-  # For details regarding adding assets from package dependencies, see
-  # https://flutter.dev/to/asset-from-package
-
-  # To add custom fonts to your application, add a fonts section here,
-  # in this "flutter" section. Each entry in this list should have a
-  # "family" key with the font family name, and a "fonts" key with a
-  # list giving the asset and other descriptors for the font. For
-  # example:
-  # fonts:
-  #   - family: Schyler
-  #     fonts:
-  #       - asset: fonts/Schyler-Regular.ttf
-  #       - asset: fonts/Schyler-Italic.ttf
-  #         style: italic
-  #   - family: Trajan Pro
-  #     fonts:
-  #       - asset: fonts/TrajanPro.ttf
-  #       - asset: fonts/TrajanPro_Bold.ttf
-  #         weight: 700
-  #
-  # For details regarding fonts from package dependencies,
-  # see https://flutter.dev/to/font-from-package
+  # Pretendard 1.3.9 (SIL OFL 1.1) — 웹(frontend)과 같은 글꼴. 정적 OTF 넷만 넣는다
+  fonts:
+    - family: Pretendard
+      fonts:
+        - asset: assets/fonts/Pretendard-Regular.otf
+          weight: 400
+        - asset: assets/fonts/Pretendard-Medium.otf
+          weight: 500
+        - asset: assets/fonts/Pretendard-SemiBold.otf
+          weight: 600
+        - asset: assets/fonts/Pretendard-Bold.otf
+          weight: 700