docs(site): update site pages for v0.1.5 theme features

- Update version references to 0.1.5 across demo/docs/index
- Add instance-level theme APIs to docs.html
- Add external theme following, theme inheritance docs
- Update index.html feature description

site/demo.html

@@ -313,9 +313,9 @@
       '',
       '| 名称 | 值 |',
       '| --- | --- |',
-      '| 版本 | 0.1.4 |',
+      '| 版本 | 0.1.5 |',
       '| 依赖 | 零 |',
-      '| 测试 | 469+ |',
+      '| 测试 | 499+ |',
       '',
       '## 新增语法',
       '',

site/docs.html

@@ -175,7 +175,7 @@
 
 <header class="docs-header">
   <h1><span class="grad">文档</span></h1>
-  <p class="sub">MetonaEditor v0.1.4 完整 API、配置与使用指南</p>
+  <p class="sub">MetonaEditor v0.1.5 完整 API、配置与使用指南</p>
 </header>
 
 <div class="container">
@@ -554,20 +554,40 @@ editor<span class="c-punc">.</span><span class="c-fn">exportHTML</span><span cla
 <section id="themes">
 <h2>主题系统</h2>
 
-<pre><span class="c-com">// 切换主题</span>
+<pre><span class="c-com">// 全局切换主题</span>
 MeEditor<span class="c-punc">.</span><span class="c-fn">setTheme</span><span class="c-punc">(</span><span class="c-str">'light'</span><span class="c-punc">);</span>         <span class="c-com">// 亮色</span>
 MeEditor<span class="c-punc">.</span><span class="c-fn">setTheme</span><span class="c-punc">(</span><span class="c-str">'dark'</span><span class="c-punc">);</span>          <span class="c-com">// 暗色</span>
 MeEditor<span class="c-punc">.</span><span class="c-fn">setTheme</span><span class="c-punc">(</span><span class="c-str">'warm'</span><span class="c-punc">);</span>          <span class="c-com">// 暖色</span>
 MeEditor<span class="c-punc">.</span><span class="c-fn">setTheme</span><span class="c-punc">(</span><span class="c-str">'auto'</span><span class="c-punc">);</span>          <span class="c-com">// 自动（默认）</span>
 
-<span class="c-com">// 注册自定义主题</span>
+<span class="c-com">// 实例级主题（v0.1.5，每个编辑器独立）</span>
+editor<span class="c-punc">.</span><span class="c-fn">setTheme</span><span class="c-punc">(</span><span class="c-str">'dark'</span><span class="c-punc">);</span>
+editor<span class="c-punc">.</span><span class="c-fn">getTheme</span><span class="c-punc">();</span>                   <span class="c-com">// 'dark'</span>
+editor<span class="c-punc">.</span><span class="c-fn">on</span><span class="c-punc">(</span><span class="c-str">'themeChange'</span><span class="c-punc">,</span> <span class="c-punc">({</span> theme <span class="c-punc">})</span> <span class="c-punc">=></span> <span class="c-punc">{});</span>
+
+<span class="c-com">// 注册自定义主题（v0.1.5: 支持继承）</span>
 <span class="c-kw">import</span> <span class="c-punc">{</span> themeUtils <span class="c-punc">}</span> <span class="c-kw">from</span> <span class="c-str">'@metona-team/metona-editor'</span><span class="c-punc">;</span>
 themeUtils<span class="c-punc">.</span><span class="c-fn">registerTheme</span><span class="c-punc">(</span><span class="c-str">'ocean'</span><span class="c-punc">,</span> <span class="c-punc">{</span>
-  bg<span class="c-punc">:</span> <span class="c-str">'#001122'</span><span class="c-punc">,</span> text<span class="c-punc">:</span> <span class="c-str">'#aabbcc'</span><span class="c-punc">,</span> accent<span class="c-punc">:</span> <span class="c-str">'#00ddff'</span><span class="c-punc">,</span>
+  extends<span class="c-punc">:</span> <span class="c-str">'dark'</span><span class="c-punc">,</span>                  <span class="c-com">// 继承 dark 主题</span>
+  accent<span class="c-punc">:</span> <span class="c-str">'#00ddff'</span><span class="c-punc">,</span>
 <span class="c-punc">});</span>
-themeUtils<span class="c-punc">.</span><span class="c-fn">applyTheme</span><span class="c-punc">(</span><span class="c-str">'ocean'</span><span class="c-punc">);</span></pre>
 
-<p>CSS 变量：主题变量限定在 <code>.me-wrapper</code> 元素上，不污染全局样式。支持 <code>@media print</code> 打印样式。</p>
+<span class="c-com">// 外部主题跟随（v0.1.5）</span>
+themeUtils<span class="c-punc">.</span><span class="c-fn">followExternalTheme</span><span class="c-punc">(</span>
+  <span class="c-punc">{</span> element<span class="c-punc">:</span> document<span class="c-punc">.</span>body<span class="c-punc">,</span> attr<span class="c-punc">:</span> <span class="c-str">'data-theme'</span> <span class="c-punc">},</span>
+  <span class="c-punc">(</span>theme<span class="c-punc">)</span> <span class="c-punc">=></span> editor<span class="c-punc">.</span><span class="c-fn">setTheme</span><span class="c-punc">(</span>theme<span class="c-punc">)</span>
+<span class="c-punc">);</span>
+
+<span class="c-com">// 从父容器继承主题</span>
+themeUtils<span class="c-punc">.</span><span class="c-fn">adoptFromParent</span><span class="c-punc">(</span>editor<span class="c-punc">.</span>container<span class="c-punc">,</span>
+  <span class="c-punc">(</span>theme<span class="c-punc">)</span> <span class="c-punc">=></span> editor<span class="c-punc">.</span><span class="c-fn">setTheme</span><span class="c-punc">(</span>theme<span class="c-punc">)</span>
+<span class="c-punc">);</span>
+
+<span class="c-com">// CSS 变量导出</span>
+themeUtils<span class="c-punc">.</span><span class="c-fn">exportCSSVars</span><span class="c-punc">();</span>              <span class="c-com">// { '--md-bg': '#fff', ... }</span>
+themeUtils<span class="c-punc">.</span><span class="c-fn">getCSSVariable</span><span class="c-punc">(</span><span class="c-str">'accent'</span><span class="c-punc">);</span>    <span class="c-com">// '#3b82f6'</span></pre>
+
+<p>CSS 变量限定在 <code>.me-wrapper</code> 元素上，不污染全局。支持 <code>@media print</code> 打印样式。v0.1.5 新增实例级主题隔离、外部跟随、主题继承。</p>
 </section>
 
 <!-- ======== 国际化 ======== -->
@@ -598,7 +618,7 @@ i18nUtils<span class="c-punc">.</span><span class="c-fn">formatDate</span><span
 
 <footer>
   <div class="container">
-    MetonaEditor v0.1.4 · <a href="https://git.metona.cn/MetonaTeam/MetonaEditor" target="_blank" rel="noopener">源码仓库</a> · MIT License
+    MetonaEditor v0.1.5 · <a href="https://git.metona.cn/MetonaTeam/MetonaEditor" target="_blank" rel="noopener">源码仓库</a> · MIT License
   </div>
 </footer>
 

site/index.html

@@ -482,7 +482,7 @@
           <svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="5"/><line x1="12" y1="1" x2="12" y2="3"/><line x1="12" y1="21" x2="12" y2="23"/><line x1="4.22" y1="4.22" x2="5.64" y2="5.64"/><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"/><line x1="1" y1="12" x2="3" y2="12"/><line x1="21" y1="12" x2="23" y2="12"/></svg>
         </div>
         <h3>主题与国际化</h3>
-        <p>基于 CSS 变量的主题系统，内置亮 / 暗 / 暖色三套主题；中英双语开箱即用，支持 RTL 布局。</p>
+        <p>实例级主题隔离、外部跟随同步、主题继承，内置 4 套预设；中英双语开箱即用，支持 RTL 布局。</p>
       </div>
       <div class="feature">
         <div class="feature-icon">