ci: add GitHub Actions workflows for upstream sync and release automation

tests/e2e/output/comprehensive/edge-cases/unicode_output.html

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+<h1 id="測試文件-test-document">測試文件 Test Document</h1>
+<p>這是一個<strong>多語言</strong>測試文件。</p>
+<h2 id="中文內容">中文內容</h2>
+<p>繁體中文測試：台灣、香港、澳門 簡體中文测试：北京、上海、广州</p>
+<h2 id="english-content">English Content</h2>
+<p>This is an English paragraph for testing.</p>
+<h2 id="日本語コンテンツ">日本語コンテンツ</h2>
+<p>これは日本語のテスト段落です。</p>
+<h2 id="한국어-콘텐츠">한국어 콘텐츠</h2>
+<p>이것은 한국어 테스트 단락입니다.</p>
+<h3 id="表格-table">表格 Table</h3>
+<table>
+<thead>
+<tr>
+<th>語言</th>
+<th>Language</th>
+<th>問候</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>中文</td>
+<td>Chinese</td>
+<td>你好</td>
+</tr>
+<tr>
+<td>英文</td>
+<td>English</td>
+<td>Hello</td>
+</tr>
+<tr>
+<td>日文</td>
+<td>Japanese</td>
+<td>こんにちは</td>
+</tr>
+<tr>
+<td>韓文</td>
+<td>Korean</td>
+<td>안녕하세요</td>
+</tr>
+</tbody>
+</table>
+<h3 id="代碼-code">代碼 Code</h3>
+<div class="sourceCode" id="cb1"><pre
+class="sourceCode javascript"><code class="sourceCode javascript"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="bu">console</span><span class="op">.</span><span class="fu">log</span>(<span class="st">&quot;Hello, 世界!&quot;</span>)<span class="op">;</span></span></code></pre></div>