移除 Core 层 OTG 相机实现，保留旅拍有线传图 UI 与本地照片上传能力。

将本地存储与上传编排下沉到 Features/TravelAlbum，删除 USB/PTP 相关代码与测试。

Co-authored-by: Cursor <cursoragent@cursor.com>

suixinkanTests/TravelAlbum/CameraDownloadStorageTests.swift

@@ -0,0 +1,76 @@
+//
+//  CameraDownloadStorageTests.swift
+//  suixinkanTests
+//
+
+import XCTest
+@testable import suixinkan
+
+/// CameraDownloadStorage 相对路径持久化测试。
+final class CameraDownloadStorageTests: XCTestCase {
+    /// 测试 scoped 原图相对路径前缀。
+    func testRelativePathUsesScopedOriginalsPrefix() {
+        let scope = CameraDownloadStorage.Scope(accountKey: "user_101", albumID: 6603)
+        defer { CameraDownloadStorage.removeScopeDirectory(for: scope) }
+
+        let fileURL = CameraDownloadStorage.originalsDirectory(for: scope).appendingPathComponent("1730_test.JPG")
+        XCTAssertEqual(
+            CameraDownloadStorage.relativePath(for: fileURL),
+            "CameraDownloads/user_101/6603/originals/1730_test.JPG"
+        )
+    }
+
+    /// 测试相对路径解析。
+    func testResolveLocalURLFromRelativePath() {
+        let stored = "CameraDownloads/user_101/6603/originals/1730_test.JPG"
+        let resolved = CameraDownloadStorage.resolveLocalURL(from: stored)
+        let expected = CameraDownloadStorage.documentsDirectory.appendingPathComponent(stored)
+        XCTAssertEqual(resolved, expected)
+    }
+
+    /// 测试 scoped 目录路径。
+    func testScopeDirectoryPath() {
+        let scope = CameraDownloadStorage.Scope(accountKey: "user_101", albumID: 6603)
+        defer { CameraDownloadStorage.removeScopeDirectory(for: scope) }
+
+        let directory = CameraDownloadStorage.scopeDirectory(for: scope)
+        XCTAssertTrue(directory.path.hasSuffix("CameraDownloads/user_101/6603"))
+    }
+
+    /// 测试唯一原图 URL 生成。
+    func testUniqueLocalURLUsesScopedOriginalsDirectory() {
+        let scope = CameraDownloadStorage.Scope(accountKey: "user_101", albumID: 6603)
+        defer { CameraDownloadStorage.removeScopeDirectory(for: scope) }
+
+        let url = CameraDownloadStorage.uniqueLocalURL(for: "DSC.JPG", scope: scope)
+        XCTAssertTrue(url.path.contains("/CameraDownloads/user_101/6603/originals/"))
+        XCTAssertTrue(url.lastPathComponent.hasSuffix("_DSC.JPG"))
+    }
+
+    /// 测试删除 scoped 目录。
+    func testRemoveScopeDirectory() throws {
+        let scope = CameraDownloadStorage.Scope(accountKey: "user_101", albumID: 6603)
+        let fileURL = CameraDownloadStorage.uniqueLocalURL(for: "remove_test.JPG", scope: scope)
+        try Data(repeating: 0xFF, count: 8).write(to: fileURL)
+
+        let directory = CameraDownloadStorage.scopeDirectory(for: scope)
+        XCTAssertTrue(FileManager.default.fileExists(atPath: directory.path))
+
+        CameraDownloadStorage.removeScopeDirectory(for: scope)
+        XCTAssertFalse(FileManager.default.fileExists(atPath: directory.path))
+    }
+
+    /// 测试预览 URL 字符串。
+    func testPreviewURLStringFromExistingFile() throws {
+        let scope = CameraDownloadStorage.Scope(accountKey: "user_101", albumID: 6603)
+        defer { CameraDownloadStorage.removeScopeDirectory(for: scope) }
+
+        let fileURL = CameraDownloadStorage.uniqueLocalURL(for: "preview.JPG", scope: scope)
+        try Data(repeating: 0xFF, count: 8).write(to: fileURL)
+
+        let stored = CameraDownloadStorage.relativePath(for: fileURL)
+        let preview = CameraDownloadStorage.previewURLString(from: stored)
+        XCTAssertFalse(preview.isEmpty)
+        XCTAssertTrue(preview.hasPrefix("file://"))
+    }
+}