fix: 修复 SignatureMethod 缺失导致 API 签名错误，错误信息增加复制按钮

apps/macos/VODManager/Sources/VODManager/Services/VODClient.swift

@@ -45,7 +45,9 @@ actor VODClient {
         return [
             "AccessKeyId": account.accessKeyId,
             "Format": "JSON",
+            "SignatureMethod": "HMAC-SHA1",
             "SignatureNonce": UUID().uuidString,
+            "SignatureVersion": "1.0",
             "Timestamp": formatter.string(from: Date()),
             "Version": "2017-03-21",
         ]

apps/macos/VODManager/Sources/VODManager/Views/VideoListView.swift

@@ -48,9 +48,20 @@ struct VideoListView: View {
             .padding()
 
             if let error = errorMessage {
-                Text(error)
+                HStack {
-                    .foregroundStyle(.red)
+                    Text(error)
-                    .padding(.horizontal)
+                        .foregroundStyle(.red)
+                    Button {
+                        NSPasteboard.general.clearContents()
+                        NSPasteboard.general.setString(error, forType: .string)
+                    } label: {
+                        Image(systemName: "doc.on.doc")
+                    }
+                    .buttonStyle(.borderless)
+                    .help("复制错误信息")
+                    Spacer()
+                }
+                .padding(.horizontal)
             }
 
             Table(of: VideoItem.self, selection: $selectedVideos) {