docs: 全面更新 README 与站点到 v0.2.5 最终状态

README:
- badge 测试数 768→780，目录补语法高亮章节
- 特性修正：解析器 99% 行覆盖、六语言、16 个高亮语言标识
- 事件表补 selectionChange / cursorMove
- 插件表补 exportPDF / searchReplace 大小写全字 / imagePaste maxSizeKB
- XSS 章节补属性级注入防护说明
- 构建章节补 npm run bench
- 源码结构补 5 个新模块（commands/floating-toolbar/context-menu/outline/highlight）

site:
- index.html: 测试数/gzip 体积更正（42KB）、新增语法高亮特性卡、
  光标选区 API 速览卡、六语言文案
- demo.html: 启用内置高亮（highlight: MeEditor.highlight）、
  新增 python/bash 代码块演示、v0.2.5 真实新特性列表、17 源文件/780 测试
- docs.html: 高亮章节补 16 标识与 CSS 定制示例、exportPDF/maxSizeKB/
  大小写全字说明、XSS 属性注入、静态 API 补 highlight 导入

src:
- styles.ts: 新增 me-hl-* 高亮配色（深浅色自适应）
- 修复复查引入的 TS 错误（普通函数 this 返回类型非法）

site/docs.html

@@ -335,12 +335,15 @@ MeEditor<span class="c-punc">.</span><span class="c-fn">setTheme</span><span cla
 MeEditor<span class="c-punc">.</span><span class="c-fn">setLocale</span><span class="c-punc">(</span><span class="c-str">'en-US'</span><span class="c-punc">);</span>
 
 <span class="c-com">// 解析器独立使用</span>
-<span class="c-kw">import</span> <span class="c-punc">{</span> parseMarkdown<span class="c-punc">,</span> parseTokens<span class="c-punc">,</span> renderTokens <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></pre>
+<span class="c-kw">import</span> <span class="c-punc">{</span> parseMarkdown<span class="c-punc">,</span> parseTokens<span class="c-punc">,</span> renderTokens <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>
+
+<span class="c-com">// 内置语法高亮</span>
+<span class="c-kw">import</span> <span class="c-punc">{</span> highlight<span class="c-punc">,</span> registerLanguage <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></pre>
 </section>
 
 <!-- 语法高亮 -->
 <section id="highlight"><h2>内置语法高亮</h2>
-<p>v0.2.5 起内置零依赖轻量高亮器，支持 js / ts / tsx / jsx / python / bash / css / html / json / yaml / markdown / java / go / rust。</p>
+<p>v0.2.5 起内置零依赖轻量高亮器，支持 js / ts / tsx / jsx / python / bash / css / html / json / yaml / markdown / java / go / rust（含 shell / md 别名共 16 个语言标识）。</p>
 <pre><span class="c-kw">import</span> MeEditor <span class="c-kw">from</span> <span class="c-str">'@metona-team/metona-editor'</span><span class="c-punc">;</span>
 
 <span class="c-com">// 方式一：作为 highlight 钩子（代码块自动高亮）</span>
@@ -351,7 +354,10 @@ MeEditor<span class="c-punc">.</span><span class="c-fn">create</span><span class
 
 <span class="c-com">// 注册自定义语言</span>
 MeEditor<span class="c-punc">.</span><span class="c-fn">registerLanguage</span><span class="c-punc">(</span><span class="c-str">'myLang'</span><span class="c-punc">,</span> <span class="c-punc">{</span> keywords<span class="c-punc">:</span> <span class="c-punc">[</span><span class="c-str">'kw'</span><span class="c-punc">]</span><span class="c-punc">,</span> builtins<span class="c-punc">:</span> <span class="c-punc">[]</span> <span class="c-punc">});</span></pre>
-<p>高亮输出使用 <code>me-hl-keyword</code> / <code>me-hl-string</code> / <code>me-hl-comment</code> / <code>me-hl-number</code> / <code>me-hl-builtin</code> / <code>me-hl-function</code> 类，可用 CSS 变量或选择器定制颜色。</p>
+<p>高亮输出使用 <code>me-hl-keyword</code> / <code>me-hl-string</code> / <code>me-hl-comment</code> / <code>me-hl-number</code> / <code>me-hl-builtin</code> / <code>me-hl-function</code> 类。内置浅色 / 深色自适应配色，可通过 CSS 覆盖定制：</p>
+<pre><span class="c-com">/* 自定义配色（覆盖内置默认） */</span>
+<span class="c-kw">.me-preview</span> <span class="c-punc">.</span><span class="c-kw">me-hl-keyword</span><span class="c-punc">{</span> color<span class="c-punc">:</span> <span class="c-str">#a855f7</span> <span class="c-punc">}</span>
+<span class="c-kw">.me-preview</span> <span class="c-punc">.</span><span class="c-kw">me-hl-string</span><span class="c-punc">{</span> color<span class="c-punc">:</span> <span class="c-str">#22c55e</span> <span class="c-punc">}</span></pre>
 </section>
 
 <!-- 解析器语法 -->
@@ -387,7 +393,7 @@ MeEditor<span class="c-punc">.</span><span class="c-fn">registerLanguage</span><
 <tr><td>反斜杠转义 <span class="badge">v0.1.15</span></td><td><code>\*</code> <code>\_</code></td><td>取消标点特殊含义</td></tr>
 </table>
 <h4>XSS 防护</h4>
-<p>所有文本经 <code>escapeHTML</code> 转义，URL 过滤 <code>javascript:</code> / <code>vbscript:</code> / <code>file:</code> / 非图片 <code>data:</code>，提供 <code>sanitize</code> 钩子。</p>
+<p>所有文本经 <code>escapeHTML</code> 转义，URL 过滤 <code>javascript:</code> / <code>vbscript:</code> / <code>file:</code> / 非图片 <code>data:</code>，属性级注入防护（<code>href</code> / <code>src</code> / <code>alt</code> / <code>title</code> 引号转义），提供 <code>sanitize</code> 钩子。</p>
 </section>
 
 <section id="parser-api"><h2>解析器 API</h2>
@@ -422,12 +428,12 @@ tokens<span class="c-punc">.</span><span class="c-fn">unshift</span><span class=
 editor<span class="c-punc">.</span><span class="c-fn">restoreDraft</span><span class="c-punc">();</span>  editor<span class="c-punc">.</span><span class="c-fn">clearDraft</span><span class="c-punc">();</span></pre>
 <h4>exportTool</h4>
 <pre>editor<span class="c-punc">.</span><span class="c-fn">use</span><span class="c-punc">(</span><span class="c-str">'exportTool'</span><span class="c-punc">);</span>
-editor<span class="c-punc">.</span><span class="c-fn">exportMarkdown</span><span class="c-punc">(</span><span class="c-str">'doc.md'</span><span class="c-punc">);</span>  editor<span class="c-punc">.</span><span class="c-fn">exportHTML</span><span class="c-punc">(</span><span class="c-str">'doc.html'</span><span class="c-punc">);</span></pre>
+editor<span class="c-punc">.</span><span class="c-fn">exportMarkdown</span><span class="c-punc">(</span><span class="c-str">'doc.md'</span><span class="c-punc">);</span>  editor<span class="c-punc">.</span><span class="c-fn">exportHTML</span><span class="c-punc">(</span><span class="c-str">'doc.html'</span><span class="c-punc">);</span>  editor<span class="c-punc">.</span><span class="c-fn">exportPDF</span><span class="c-punc">();</span></pre>
 <h4>searchReplace</h4>
 <pre>editor<span class="c-punc">.</span><span class="c-fn">use</span><span class="c-punc">(</span><span class="c-str">'searchReplace'</span><span class="c-punc">);</span>
-<span class="c-com">// Ctrl+F 查找 / Ctrl+H 替换</span></pre>
+<span class="c-com">// Ctrl+F 查找 / Ctrl+H 替换，支持正则 .* 、大小写 Aa、全字 ab 开关</span></pre>
 <h4>imagePaste</h4>
-<pre>editor<span class="c-punc">.</span><span class="c-fn">use</span><span class="c-punc">(</span><span class="c-str">'imagePaste'</span><span class="c-punc">);</span>  <span class="c-com">// 粘贴图片自动转 base64</span></pre>
+<pre>editor<span class="c-punc">.</span><span class="c-fn">use</span><span class="c-punc">(</span><span class="c-str">'imagePaste'</span><span class="c-punc">,</span> <span class="c-punc">{</span> maxSizeKB<span class="c-punc">:</span> <span class="c-num">500</span> <span class="c-punc">});</span>  <span class="c-com">// 粘贴图片转 base64，超限警告</span></pre>
 <h4>shortcutHelp</h4>
 <pre>editor<span class="c-punc">.</span><span class="c-fn">use</span><span class="c-punc">(</span><span class="c-str">'shortcutHelp'</span><span class="c-punc">);</span>  <span class="c-com">// 按 ? 弹出快捷键面板</span></pre>
 <h4>fileSystem</h4>