Fix test failures in CI/CD: GB2312 encoding and Linux build script

[Copilot]

CI tests failed on Ubuntu due to character encoding mismatch and incorrect build script invocation. 13/804 tests were failing because test files used GB2312 encoding while source code uses UTF-8, causing Chinese character assertions to fail.

Changes

• Convert test files to UTF-8: RecordTests.cs and HttpResponseMessageExtensionsTests.cs from GB2312 → UTF-8
• Fix workflow command: Remove Windows build.cmd fallback on Linux, use ./build.sh Test directly

The encoding issue manifested as:

// Test assertion (was GB2312 encoded)
Assert.IsTrue(exception.Message.Contains("行索引 -1 超出有效范围"));

// Source exception message (UTF-8)
throw new ArgumentOutOfRangeException(nameof(row), $"行索引 {row} 超出有效范围 [0, {Record.Count - 1}]");

All 804 tests now pass.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>解决测试报错</issue_title>
<issue_description>以下 nuke-test.yml 文件测试 ci、cd 报错。但是 Windows 上我没有复现。

name: Run Nuke Test on Push

on:
  push:

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Setup .NET
        uses: actions/setup-dotnet@v4
        with:
          dotnet-version: 10.0.x  # 更新至实际使用的 .NET 版本

      - name: Restore dependencies
        run: dotnet restore

      - name: Run Nuke Build Test
        run: ./build.cmd Test || ./build.sh Test
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes 解决测试报错 #54

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[Copilot]

Pull request overview

This pull request fixes CI/CD test failures on Ubuntu that were caused by character encoding mismatches between test files and source code. The test files were using GB2312 encoding while the source code uses UTF-8, causing 13 out of 804 tests to fail when validating Chinese error messages.

Changes:

• Converted Chinese text in test files from GB2312 to UTF-8 encoding to match source code
• Simplified workflow build command to directly use ./build.sh Test on Linux instead of the fallback pattern

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tests/LuYao.Common.UnitTests/Data/RecordTests.cs	Converted all Chinese comments and exception message assertions from GB2312 to UTF-8
tests/LuYao.Common.UnitTests/Net/Http/HttpResponseMessageExtensionsTests.cs	Converted Chinese string literals in test cases from GB2312 to UTF-8
.github/workflows/nuke-test.yml	Simplified build command to directly call ./build.sh Test for ubuntu-latest runner

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