修复统计图

src/Jiaowu.Api/Controllers/StatisticsController.cs

@@ -25,7 +25,12 @@ public sealed class StatisticsController(
         SystemRoles.CollegeAdmin + "," +
         SystemRoles.Leader;
 
-    private Guid? RestrictedCollegeId => currentUserDataScope.Current.RestrictedCollegeId;
+    // HybridCache may execute its source factory without the request's ambient
+    // HttpContext. Keep the authorization scope stable for the whole controller
+    // invocation instead of resolving it again inside that background factory.
+    private readonly CurrentUserScope currentUser = currentUserDataScope.Current;
+
+    private Guid? RestrictedCollegeId => currentUser.RestrictedCollegeId;
 
     private Guid? ResolveCollegeId(Guid? requestedCollegeId)
     {
@@ -982,7 +987,7 @@ public sealed class StatisticsController(
         params string?[] filters) =>
         AppCacheKeys.Statistics(
             area,
-            currentUserDataScope.Current.Scope.ToString(),
+            currentUser.Scope.ToString(),
             effectiveCollegeId,
             filters);