Feat/#21 travel follow shop info

Projects/Domain/Sources/Interface/Follow/FollowServiceProtocol.swift

@@ -10,8 +10,14 @@ import Foundation
 
 public protocol FollowServiceProtocol: Sendable {
     /// 여행 상세 정보 조회
-    func fetchTravelDetail(id: Int) async -> Result<TravelDetail, FollowError>
+    func fetchTravelDetail(id: Int) async -> Result<TravelDetail, ContentCardError>
 
     /// 일차별 장소 목록 조회
-    func fetchPlaces(travelId: Int, day: Int) async -> Result<[TravelPlace], FollowError>
+    func fetchPlaces(travelId: Int, day: Int) async -> Result<[TravelPlace], ItineraryError>
+
+    /// 장소 상세 조회
+    func fetchPlaceDetail(googlePlaceId: String) async -> Result<PlaceDetail, PlaceDetailError>
+
+    /// 장소 사진 조회
+    func fetchPlacePhotos(googlePlaceId: String) async -> Result<[PlacePhoto], PlacePhotosError>
 }

Projects/Domain/Sources/Model/Follow/Error/ContentCardError.swift

@@ -0,0 +1,19 @@
+//
+//  ContentCardError.swift
+//  Domain
+//
+//  Created by kimnahun on 2026-02-09.
+//  Copyright © 2026 NDGL-iOS. All rights reserved.
+//
+
+import Foundation
+
+/// 여행 템플릿 상세 조회 API 에러
+public enum ContentCardError: Error, Sendable {
+    /// 여행 템플릿을 찾을 수 없음 (TRAVEL-02-001)
+    case notFound(message: String)
+    /// 서버 에러 (COMM-08-001)
+    case serverError(message: String)
+    /// 알 수 없는 에러
+    case unknown(code: String, message: String)
+}

Projects/Domain/Sources/Model/Follow/Error/ItineraryError.swift

@@ -0,0 +1,19 @@
+//
+//  ItineraryError.swift
+//  Domain
+//
+//  Created by kimnahun on 2026-02-09.
+//  Copyright © 2026 NDGL-iOS. All rights reserved.
+//
+
+import Foundation
+
+/// 여행 템플릿 일정 조회 API 에러
+public enum ItineraryError: Error, Sendable {
+    /// 여행 템플릿을 찾을 수 없음 (TRAVEL-02-001)
+    case notFound(message: String)
+    /// 서버 에러 (COMM-08-001)
+    case serverError(message: String)
+    /// 알 수 없는 에러
+    case unknown(code: String, message: String)
+}

Projects/Domain/Sources/Model/Follow/Error/PlaceDetailError.swift

@@ -0,0 +1,19 @@
+//
+//  PlaceDetailError.swift
+//  Domain
+//
+//  Created by kimnahun on 2026-02-09.
+//  Copyright © 2026 NDGL-iOS. All rights reserved.
+//
+
+import Foundation
+
+/// 장소 상세 조회 API 에러
+public enum PlaceDetailError: Error, Sendable {
+    /// 필수 요청 파라미터가 존재하지 않음 (COMM-01-006)
+    case missingParameter(message: String)
+    /// 장소를 찾을 수 없음 (PLACE-02-001)
+    case notFound(message: String)
+    /// 알 수 없는 에러
+    case unknown(code: String, message: String)
+}

Projects/Domain/Sources/Model/Follow/Error/PlacePhotosError.swift

@@ -0,0 +1,21 @@
+//
+//  PlacePhotosError.swift
+//  Domain
+//
+//  Created by kimnahun on 2026-02-09.
+//  Copyright © 2026 NDGL-iOS. All rights reserved.
+//
+
+import Foundation
+
+/// 장소 사진 조회 API 에러
+public enum PlacePhotosError: Error, Sendable {
+    /// 필수 요청 파라미터가 존재하지 않음 (COMM-01-006)
+    case missingParameter(message: String)
+    /// 서버 에러 (COMM-08-001)
+    case serverError(message: String)
+    /// Google Maps Places API 호출 실패 (GMAP_PLACE-07-001)
+    case googleApiError(message: String)
+    /// 알 수 없는 에러
+    case unknown(code: String, message: String)
+}

Projects/Domain/Sources/Model/Follow/PlaceDetail.swift

@@ -0,0 +1,64 @@
+//
+//  PlaceDetail.swift
+//  Domain
+//
+//  Created by kimnahun on 2026-02-09.
+//  Copyright © 2026 NDGL-iOS. All rights reserved.
+//
+
+import Foundation
+
+/// 장소 상세 정보
+public struct PlaceDetail: Hashable {
+    public let id: String
+    public let name: String
+    public let thumbnail: String?
+    public let nationalPhoneNumber: String?
+    public let internationalPhoneNumber: String?
+    public let formattedAddress: String?
+    public let location: PlaceLocation
+    public let userRatingCount: Int?
+    public let rating: Double?
+    public let regularOpeningHours: [String]?
+    public let googleMapsUri: String?
+    public let websiteUri: String?
+
+    public init(
+        id: String,
+        name: String,
+        thumbnail: String? = nil,
+        nationalPhoneNumber: String? = nil,
+        internationalPhoneNumber: String? = nil,
+        formattedAddress: String? = nil,
+        location: PlaceLocation,
+        userRatingCount: Int? = nil,
+        rating: Double? = nil,
+        regularOpeningHours: [String]? = nil,
+        googleMapsUri: String? = nil,
+        websiteUri: String? = nil
+    ) {
+        self.id = id
+        self.name = name
+        self.thumbnail = thumbnail
+        self.nationalPhoneNumber = nationalPhoneNumber
+        self.internationalPhoneNumber = internationalPhoneNumber
+        self.formattedAddress = formattedAddress
+        self.location = location
+        self.userRatingCount = userRatingCount
+        self.rating = rating
+        self.regularOpeningHours = regularOpeningHours
+        self.googleMapsUri = googleMapsUri
+        self.websiteUri = websiteUri
+    }
+}
+
+/// 장소 위치 정보
+public struct PlaceLocation: Hashable {
+    public let latitude: Double
+    public let longitude: Double
+
+    public init(latitude: Double, longitude: Double) {
+        self.latitude = latitude
+        self.longitude = longitude
+    }
+}

Projects/Domain/Sources/Model/Follow/PlacePhoto.swift

@@ -0,0 +1,22 @@
+//
+//  PlacePhoto.swift
+//  Domain
+//
+//  Created by kimnahun on 2026-02-09.
+//  Copyright © 2026 NDGL-iOS. All rights reserved.
+//
+
+import Foundation
+
+/// 장소 사진 정보
+public struct PlacePhoto: Hashable {
+    public let photoUri: String
+    public let widthPx: Int
+    public let heightPx: Int
+
+    public init(photoUri: String, widthPx: Int, heightPx: Int) {
+        self.photoUri = photoUri
+        self.widthPx = widthPx
+        self.heightPx = heightPx
+    }
+}

Projects/Domain/Sources/Model/Travel/TravelDetail.swift

@@ -43,15 +43,15 @@ public struct YouTubeInfo: Hashable {
     public let youtuber: String
     public let thumbnail: String?
     public let profileImage: String?
-    public let link: String
+    public let link: String?
     public let summary: String
 
     public init(
         title: String,
         youtuber: String,
         thumbnail: String?,
         profileImage: String?,
-        link: String,
+        link: String?,
         summary: String
     ) {
         self.title = title

Projects/Domain/Sources/Model/Travel/TravelPlace.swift

@@ -16,7 +16,7 @@ public struct TravelPlace: Hashable {
     public let distanceKm: Double?
     public let transportation: [Transportation]
     public let youtubeTips: [String]
-    public let planB: [PlaceInfo]
+    public let planB: [PlanBInfo]
     public let estimatedDuration: Int?
     public let place: PlaceInfo
 
@@ -27,7 +27,7 @@ public struct TravelPlace: Hashable {
         distanceKm: Double? = nil,
         transportation: [Transportation] = [],
         youtubeTips: [String] = [],
-        planB: [PlaceInfo] = [],
+        planB: [PlanBInfo] = [],
         estimatedDuration: Int? = nil,
         place: PlaceInfo
     ) {
@@ -43,6 +43,17 @@ public struct TravelPlace: Hashable {
     }
 }
 
+/// 플랜B 정보
+public struct PlanBInfo: Hashable {
+    public let name: String
+    public let feature: String?
+
+    public init(name: String, feature: String? = nil) {
+        self.name = name
+        self.feature = feature
+    }
+}
+
 /// 교통수단 정보
 public struct Transportation: Hashable {
     public let mode: String

Projects/Features/FollowFeature/Sources/FollowDetailBuilder.swift

@@ -18,7 +18,7 @@ public protocol FollowDetailDependency: Dependency {
 
 // MARK: - FollowDetailComponent
 
-final class FollowDetailComponent: Component<FollowDetailDependency>, TripCalendarDependency {
+final class FollowDetailComponent: Component<FollowDetailDependency>, TripCalendarDependency, PlaceDetailDependency {
     var followService: FollowServiceProtocol {
         dependency.followService
     }
@@ -54,11 +54,13 @@ public final class FollowDetailBuilder: Builder<FollowDetailDependency>, FollowD
         interactor.listener = listener
 
         let tripCalendarBuilder = TripCalendarBuilder(dependency: component)
+        let placeDetailBuilder = PlaceDetailBuilder(dependency: component)
 
         let router = FollowDetailRouter(
             interactor: interactor,
             viewController: viewController,
-            tripCalendarBuilder: tripCalendarBuilder
+            tripCalendarBuilder: tripCalendarBuilder,
+            placeDetailBuilder: placeDetailBuilder
         )
 
         return router

Projects/Features/FollowFeature/Sources/FollowDetailInteractor.swift

@@ -27,7 +27,6 @@ protocol FollowDetailPresentable: Presentable {
     func hideLoading()
     func updateTravelDetail(_ detail: TravelDetail)
     func updatePlaces(_ places: [TravelPlace])
-    func updateBudget(_ budget: Int)
     func showPlaceDetail(_ place: TravelPlace)
 }
 
@@ -38,6 +37,7 @@ protocol FollowDetailPresentableListener: AnyObject {
     func didTapAddToTrip()
     func didSelectDay(_ day: Int)
     func didSelectPlace(_ place: TravelPlace)
+    func didTapPlaceDetailChevron(_ place: TravelPlace)
 }
 
 // MARK: - FollowDetailInteractor
@@ -105,7 +105,6 @@ final class FollowDetailInteractor: PresentableInteractor<FollowDetailPresentabl
                 self.placesByDay[1] = places
                 presenter.updateTravelDetail(detail)
                 presenter.updatePlaces(places)
-                updateBudgetForDay(1)
                 presenter.hideLoading()
             }
         }
@@ -114,7 +113,6 @@ final class FollowDetailInteractor: PresentableInteractor<FollowDetailPresentabl
     private func loadPlaces(for day: Int) {
         if let cachedPlaces = placesByDay[day] {
             presenter.updatePlaces(cachedPlaces)
-            updateBudgetForDay(day)
             return
         }
 
@@ -129,17 +127,10 @@ final class FollowDetailInteractor: PresentableInteractor<FollowDetailPresentabl
             await MainActor.run {
                 self.placesByDay[day] = places
                 presenter.updatePlaces(places)
-                updateBudgetForDay(day)
                 presenter.hideLoading()
             }
         }
     }
-
-    private func updateBudgetForDay(_ day: Int) {
-        guard let detail = travelDetail else { return }
-        let dailyBudget = detail.budgetPerPerson / detail.days
-        presenter.updateBudget(dailyBudget)
-    }
 }
 
 // MARK: - FollowDetailPresentableListener
@@ -163,6 +154,19 @@ extension FollowDetailInteractor: FollowDetailPresentableListener {
     func didSelectPlace(_ place: TravelPlace) {
         presenter.showPlaceDetail(place)
     }
+
+    func didTapPlaceDetailChevron(_ place: TravelPlace) {
+        let youtuberName = travelDetail?.youtube.youtuber ?? ""
+        router?.routeToPlaceDetail(travelPlace: place, youtuberName: youtuberName)
+    }
+}
+
+// MARK: - PlaceDetailListener
+
+extension FollowDetailInteractor: PlaceDetailListener {
+    func placeDetailDidTapBack() {
+        router?.detachPlaceDetail()
+    }
 }
 
 // MARK: - TripCalendarListener