修复勤务日榜在线时长：CASE WHEN 实时算 open session 时长；关闭 stale 日志时补算 duration_seconds

app/Http/Controllers/DutyHallController.php

@@ -50,7 +50,17 @@ class DutyHallController extends Controller
 
             // ① 在线时长（position_duty_logs）
             $dutyQuery = PositionDutyLog::query()
-                ->selectRaw('user_id, SUM(duration_seconds) as total_seconds, COUNT(*) as checkin_count');
+                ->selectRaw('
+                    user_id,
+                    SUM(
+                        CASE
+                            WHEN logout_at IS NULL
+                            THEN GREATEST(0, TIMESTAMPDIFF(SECOND, login_at, NOW()))
+                            ELSE duration_seconds
+                        END
+                    ) as total_seconds,
+                    COUNT(*) as checkin_count
+                ');
 
             // ② 管理操作（position_authority_logs，排除任命/撤销等人事操作）
             $authQuery = PositionAuthorityLog::query()