feat(flutter): 펫 명함 만들기·상세·관리·공유 구현

홈에서 아이를 등록한 뒤 이어지는 흐름이라 먼저 만든다.
명함은 기기에 저장하고(아이별 대표 명함 지정), 공유는 명함을 이미지로
그려 기기 공유 창과 QR 로 보낸다. 명함 받기는 서버가 필요해 안내만 둔다.

- 아이를 삭제하면 그 아이의 명함도 함께 지운다
- 수정 화면은 아이 목록을 다 불러온 뒤 연다 (새 등록으로 오인 방지)
- 의존성: share_plus, qr_flutter

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

flutter/pubspec.lock

@@ -153,6 +153,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.2.0"
+  ffi_leak_tracker:
+    dependency: transitive
+    description:
+      name: ffi_leak_tracker
+      sha256: "4093d4ef9ca06ffe2786e73bfb25e22aa92112b9bb4ec941f11e3e6b61489a97"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.1.2"
   file:
     dependency: transitive
     description:
@@ -193,6 +201,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.9.3+6"
+  fixnum:
+    dependency: transitive
+    description:
+      name: fixnum
+      sha256: b6dc7065e46c974bc7c5f143080a6764ec7a4be6da1285ececdc37be96de53be
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.1"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -274,10 +290,10 @@ packages:
     dependency: transitive
     description:
       name: flutter_secure_storage_windows
-      sha256: "3b7c8e068875dfd46719ff57c90d8c459c87f2302ed6b00ff006b3c9fcad1613"
+      sha256: "471951813a97006d899db4948acc654a4f28c440083ea08178935ce20b173ec1"
       url: "https://pub.dev"
     source: hosted
-    version: "4.1.0"
+    version: "4.2.2"
   flutter_svg:
     dependency: "direct main"
     description:
@@ -648,6 +664,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.2.0"
+  qr:
+    dependency: transitive
+    description:
+      name: qr
+      sha256: "5a1d2586170e172b8a8c8470bbbffd5eb0cd38a66c0d77155ea138d3af3a4445"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.2"
+  qr_flutter:
+    dependency: "direct main"
+    description:
+      name: qr_flutter
+      sha256: "5095f0fc6e3f71d08adef8feccc8cea4f12eec18a2e31c2e8d82cb6019f4b097"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.1.0"
   riverpod:
     dependency: transitive
     description:
@@ -656,6 +688,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.2.1"
+  share_plus:
+    dependency: "direct main"
+    description:
+      name: share_plus
+      sha256: "34f00f9becd2743c1fb05363d624f9f70d37f7ccdcdda47450bc0b8c9d327b8c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "13.3.0"
+  share_plus_platform_interface:
+    dependency: transitive
+    description:
+      name: share_plus_platform_interface
+      sha256: "365ef7379fc22507256adda3385152942ffce08935452bc972c2e52a0bebae41"
+      url: "https://pub.dev"
+    source: hosted
+    version: "7.2.0"
   shared_preferences:
     dependency: "direct main"
     description:
@@ -845,6 +893,46 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.4.0"
+  url_launcher_linux:
+    dependency: transitive
+    description:
+      name: url_launcher_linux
+      sha256: "10f86fef4c2c43563fa6c211ff9cf757adf4d3ab762c56bd430664a947d70cd0"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.2.3"
+  url_launcher_platform_interface:
+    dependency: transitive
+    description:
+      name: url_launcher_platform_interface
+      sha256: "552f8a1e663569be95a8190206a38187b531910283c3e982193e4f2733f01029"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.3.2"
+  url_launcher_web:
+    dependency: transitive
+    description:
+      name: url_launcher_web
+      sha256: "85c81589622fbc87c1c683aaea164d3604a7777495a79d91e39ffcdec39ddb34"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.3"
+  url_launcher_windows:
+    dependency: transitive
+    description:
+      name: url_launcher_windows
+      sha256: "6c5ad3f22cd4c38e089b81963b3cd7bb83b111b2df5dce008bb066162f42e429"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.6"
+  uuid:
+    dependency: transitive
+    description:
+      name: uuid
+      sha256: "9b129329f58692f6e6578329498a8fe9fbe98f090beb764ffbb8ee2eadd01dcd"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.6.0"
   vector_graphics:
     dependency: transitive
     description:
@@ -929,10 +1017,10 @@ packages:
     dependency: transitive
     description:
       name: win32
-      sha256: d7cb55e04cd34096cd3a79b3330245f54cb96a370a1c27adb3c84b917de8b08e
+      sha256: a0b93865d5644f11cf6a8c3f6db909f1ec168958b5805f6cc684adea957cd63d
       url: "https://pub.dev"
     source: hosted
-    version: "5.15.0"
+    version: "6.4.0"
   xdg_directories:
     dependency: transitive
     description: