diag(client/macos): StatsClient 每5帧打印收到的 urltest 延迟,排查连接页延迟为 —

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/macos/Runner/StatsClient.swift

@@ -20,6 +20,7 @@ final class StatsClient: NSObject {
     private let queue = DispatchQueue(label: "pangolin.stats.client")
     private weak var session: NETunnelProviderSession?
     private var timer: DispatchSourceTimer?
+    private var diagTick = 0 // 诊断:每 5 帧打一次 urltest,排查延迟为何不刷新
 
     // ── 生命周期 ────────────────────────────────────────────────
 
@@ -61,6 +62,14 @@ final class StatsClient: NSObject {
                     NSLog("[pangolin/stats] bad stats payload (%d bytes)", resp.count)
                     return
                 }
+                // 诊断:确认 urltest 延迟是否随统计帧一起到达(连接页延迟靠它)。
+                self.diagTick += 1
+                if self.diagTick % 5 == 0 {
+                    let urls = (obj["urltestResults"] as? [[String: Any]]) ?? []
+                    let pairs = urls.map { "\($0["tag"] ?? "?")=\($0["delayMs"] ?? -1)" }.joined(separator: ",")
+                    NSLog("[pangolin/stats] dl=%@ ul=%@ urltest[%d]=%@",
+                          "\(obj["downloadSpeed"] ?? 0)", "\(obj["uploadSpeed"] ?? 0)", urls.count, pairs)
+                }
                 self.emit(obj)
             }
         } catch {