feat: Phase 2 — google_mobile_ads 7.x, flutter_lints 6, CHANGELOG v1.1.0

- google_mobile_ads 5.3→7.x (iOS Privacy Manifest 대응)
- flutter_lints 5→6 (최신 lint 규칙)
- CHANGELOG.md 전면 재작성 (v1.0.1, v1.1.0 릴리즈 이력)
- 버전 1.0.1+2 → 1.1.0+3
- freezed 3.x 마이그레이션 보류 (호환성 문제, 2.x 유지)

pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # 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.
-version: 1.0.1+2
+version: 1.1.0+3
 
 environment:
   sdk: ^3.9.2
@@ -41,7 +41,7 @@ dependencies:
   freezed_annotation: ^2.4.1
   json_annotation: ^4.9.0
   # AdMob 광고
-  google_mobile_ads: ^5.3.0
+  google_mobile_ads: ^7.0.0
   # IAP (인앱 결제)
   in_app_purchase: ^3.2.0
   # IAP 구매 상태 보안 저장 (secure storage)
@@ -67,7 +67,7 @@ dev_dependencies:
   # 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: ^5.0.0
+  flutter_lints: ^6.0.0
   flutter_launcher_icons: ^0.14.3
 
 # 앱 아이콘 설정 (flutter_launcher_icons)