fix(ci): stabilize oversized body check [CI]

server/tests/WebDrop.Api.Tests/RestTests.cs

@@ -193,7 +193,7 @@ public class RestTests(ServerFixture s) : IClassFixture<ServerFixture>
         // 超过 1 MiB 负载上限但小于 Kestrel 的 2 MiB:服务自己拒绝
         await AssertErrorAsync(await s.AppendAsync(ch, ch.Owner, Frame(NewId(), 0, 1, 1_500_000)), 413, "too_large");
         // 超过 Kestrel 上限:框架拒绝,仍映射为同一错误码
-        await AssertErrorAsync(await s.AppendAsync(ch, ch.Owner, Frame(NewId(), 0, 1, 3_000_000)), 413, "too_large");
+        await AssertErrorAsync(await s.AppendAsync(ch, ch.Owner, Frame(NewId(), 0, 1, 3_000_000), expectContinue: true), 413, "too_large");
     }
 
     [Fact]