Add trash service

Sources/Photochk/Services/TrashService.swift

@@ -0,0 +1,30 @@
+import AppKit
+import Foundation
+
+/// 選択されたファイルをゴミ箱へ送る。削除ではないので Finder から戻せる。
+enum TrashService {
+    struct Outcome: Sendable {
+        var trashed: [URL] = []
+        var failed: [URL] = []
+        var errorDescription: String?
+    }
+
+    @MainActor
+    static func moveToTrash(_ urls: [URL]) async -> Outcome {
+        guard !urls.isEmpty else { return Outcome() }
+
+        let (moved, error): ([URL: URL], Error?) = await withCheckedContinuation { continuation in
+            NSWorkspace.shared.recycle(urls) { newURLs, error in
+                continuation.resume(returning: (newURLs, error))
+            }
+        }
+
+        let trashed = urls.filter { moved[$0] != nil }
+        let failed = urls.filter { moved[$0] == nil }
+        return Outcome(
+            trashed: trashed,
+            failed: failed,
+            errorDescription: failed.isEmpty ? nil : error?.localizedDescription
+        )
+    }
+}