feat: complete TASK-WP0-08 logging

supervisor/Dada.Supervisor/SupervisorForm.cs

@@ -268,6 +268,8 @@ internal sealed class SupervisorForm : Form
 
 internal sealed class DiagnosticsForm : Form
 {
+    internal string CopyPayload { get; }
+
     internal DiagnosticsForm(SupervisorState state)
     {
         BackColor = Color.White;
@@ -281,11 +283,22 @@ internal sealed class DiagnosticsForm : Form
         checks.Columns.Add("组件", 170);
         checks.Columns.Add("状态", 110);
         checks.Columns.Add("检查结果", 390);
+        var report = DiagnosticReport.Create(
+            state,
+            [
+                state == SupervisorState.StorageUnavailable
+                    ? DiagnosticCheck.Fail("log_writable", "log_write_failed")
+                    : DiagnosticCheck.Pass("log_writable", "log_ready"),
+                DiagnosticCheck.Pass("fixed_port", "loopback_only"),
+            ],
+            new DiagnosticStorageSummary(0, 0, 0),
+            []);
+        CopyPayload = System.Text.Json.JsonSerializer.Serialize(report, new System.Text.Json.JsonSerializerOptions { WriteIndented = true });
         checks.Items.Add(new ListViewItem(["Supervisor", "正常", StateLabel(state)]));
         checks.Items.Add(new ListViewItem(["固定端口", "43121", "仅绑定 127.0.0.1"]));
         checks.Items.Add(new ListViewItem(["凭据", "已脱敏", "仅显示是否已配置"]));
         var copy = new Button { Location = new Point(592, 382), Size = new Size(138, 36), Text = "复制脱敏结果" };
-        copy.Click += (_, _) => Clipboard.SetText("Dada diagnostics: redacted");
+        copy.Click += (_, _) => Clipboard.SetText(CopyPayload);
         Controls.AddRange([title, detail, checks, copy]);
     }