test: the admin requests list test names the requester by their seeded username (#6265)

seedUser stores users as test-<name>, so the assertion compares against
alice.Username rather than the literal "alice".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/api/admin_requests_test.go

@@ -90,8 +90,8 @@ func TestHandleListAdminRequests_DefaultStatus_Pending(t *testing.T) {
 		if rv.Status != "pending" {
 			t.Errorf("result status = %q, want pending", rv.Status)
 		}
-		if rv.Username != "alice" {
-			t.Errorf("result username = %q, want alice (the requester)", rv.Username)
+		if rv.Username != alice.Username {
+			t.Errorf("result username = %q, want %q (the requester)", rv.Username, alice.Username)
 		}
 	}
 }