🔧 :: App/ThirdPartyLib/Flow의 중복 FCM 패키지 선언 제거

루트 Package.swift의 firebase-ios-sdk를 .external(name:)로 통일했으므로
각 모듈에서 별도로 들고 있던 packages: [.FCM] 선언은 더 이상 불필요.
dependencies: [.SPM.FCM]은 그대로 유지되며 이제 단일 Tuist 의존성
그래프를 통해 resolve된다.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: leejh08

Projects/App/Project.swift

@@ -95,7 +95,6 @@ let schemes: [Scheme] = [
 let project = Project(
     name: env.targetName,
     organizationName: env.organizationName,
-    packages: [.FCM],
     settings: settings,
     targets: targets,
     schemes: schemes

Projects/Flow/Project.swift

@@ -6,7 +6,6 @@ let project = Project.makeModule(
     name: "Flow",
     product: .staticLibrary,
     targets: [.unitTest],
-    packages: [.FCM],
     dependencies: [
         .Projects.data,
         .Projects.presentation,

Projects/Modules/ThirdPartyLib/Project.swift

@@ -6,7 +6,6 @@ let project = Project.makeModule(
     name: "ThirdPartyLib",
     product: .staticFramework,
     targets: [],
-    packages: [.FCM],
     dependencies: [
         .SPM.RxCocoa,
         .SPM.RxFlow,