feat(monetization): 수익화 시스템 기반 모델 추가

- MonetizationState freezed 모델 추가
- google_mobile_ads, in_app_purchase 의존성 추가
- IAP 구매 상태, 버프 종료 시점, 복귀 보상 데이터 관리

pubspec.lock

@@ -301,6 +301,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.3"
+  google_mobile_ads:
+    dependency: "direct main"
+    description:
+      name: google_mobile_ads
+      sha256: "0d4a3744b5e8ed1b8be6a1b452d309f811688855a497c6113fc4400f922db603"
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.3.1"
   graphs:
     dependency: transitive
     description:
@@ -341,6 +349,38 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "4.7.2"
+  in_app_purchase:
+    dependency: "direct main"
+    description:
+      name: in_app_purchase
+      sha256: "5cddd7f463f3bddb1d37a72b95066e840d5822d66291331d7f8f05ce32c24b6c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.2.3"
+  in_app_purchase_android:
+    dependency: transitive
+    description:
+      name: in_app_purchase_android
+      sha256: abb254ae159a5a9d4f867795ecb076864faeba59ce015ab81d4cca380f23df45
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.4.0+8"
+  in_app_purchase_platform_interface:
+    dependency: transitive
+    description:
+      name: in_app_purchase_platform_interface
+      sha256: "1d353d38251da5b9fea6635c0ebfc6bb17a2d28d0e86ea5e083bf64244f1fb4c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.0"
+  in_app_purchase_storekit:
+    dependency: transitive
+    description:
+      name: in_app_purchase_storekit
+      sha256: f7cbbd7fb47ab5a4fb736fc3f20ae81a4f6def0af9297b3c525ca727761e2589
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.4.7"
   intl:
     dependency: "direct main"
     description:
@@ -834,6 +874,38 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.0.3"
+  webview_flutter:
+    dependency: transitive
+    description:
+      name: webview_flutter
+      sha256: a3da219916aba44947d3a5478b1927876a09781174b5a2b67fa5be0555154bf9
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.13.1"
+  webview_flutter_android:
+    dependency: transitive
+    description:
+      name: webview_flutter_android
+      sha256: eeeb3fcd5f0ff9f8446c9f4bbc18a99b809e40297528a3395597d03aafb9f510
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.10.11"
+  webview_flutter_platform_interface:
+    dependency: transitive
+    description:
+      name: webview_flutter_platform_interface
+      sha256: "63d26ee3aca7256a83ccb576a50272edd7cfc80573a4305caa98985feb493ee0"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.14.0"
+  webview_flutter_wkwebview:
+    dependency: transitive
+    description:
+      name: webview_flutter_wkwebview
+      sha256: e49f378ed066efb13fc36186bbe0bd2425630d4ea0dbc71a18fdd0e4d8ed8ebc
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.23.5"
   xdg_directories:
     dependency: transitive
     description: