feat(parser): v0.1.15 — parser short+medium term improvements

Short-term fixes:
- Fix ***bold italic*** / ___bold italic___ triple emphasis
- Fix link text inline formatting (recursive renderInline on [**bold**](url))
- Fix backtick inline code nesting (CommonMark-compliant extractInlineCodes)
- Fix tab indentation stripping in indented code blocks

Medium-term improvements:
- parseTokens() / renderTokens() separation API for token-level transform
- registerBlockHandler() table-driven block handler registry
- Backslash escape support (\* \_ \)

Also:
- Add 48 new test cases (583 total, 7 suites, all passing)
- Parser coverage: 95.43% stmts / 91.38% branches / 100% funcs / 98.25% lines
- Update README.md, site/, package.json to v0.1.15

site/demo.html

@@ -4,7 +4,7 @@
 <meta charset="utf-8"/>
 <meta name="viewport" content="width=device-width, initial-scale=1"/>
 <link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>📝</text></svg>"/>
-<title>MetonaEditor v0.1.14 — 全功能演示</title>
+<title>MetonaEditor v0.1.15 — 全功能演示</title>
 <style>
 *,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
 :root{--app-bg:#f5f6f8;--app-text:#1a1a2e;--app-card:#fff;--app-border:#e5e7eb;--app-accent:#3b82f6;--app-accent2:#8b5cf6;--header-bg:linear-gradient(135deg,#1e293b 0%,#0f172a 100%);--header-text:#f1f5f9;--badge-bg:rgba(255,255,255,.12);--badge-text:#e2e8f0}
@@ -47,9 +47,9 @@ body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Micr
 <header class="header">
   <h1><span class="grad">Metona</span>Editor</h1>
   <div class="badges">
-    <span class="badge">v0.1.14</span>
+    <span class="badge">v0.1.15</span>
     <span class="badge">零依赖</span>
-    <span class="badge">535 tests</span>
+    <span class="badge">558 tests</span>
     <span class="badge">6 插件</span>
     <span class="badge">中文优先</span>
   </div>
@@ -79,7 +79,8 @@ body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Micr
 </div>
 
 <div class="info-grid">
-  <div class="info-card"><div class="icon">🎨</div><h4>语法高亮编辑区</h4><p>标题/粗体/斜体/代码/链接/图片/列表等 10 种语法实时着色</p></div>
+  <div class="info-card"><div class="icon">🎨</div><h4>三重强调 + 链接内格式</h4><p>***粗斜体*** / [**粗体链接**](url) 等语法正确渲染 ← v0.1.15</p></div>
+  <div class="info-card"><div class="icon">🔧</div><h4>块级处理器表驱动</h4><p>registerBlockHandler 注册自定义语法，parseTokens/renderTokens 分离</p></div>
   <div class="info-card"><div class="icon">📂</div><h4>磁盘文件读写</h4><p>File System Access API 打开/保存真实磁盘 .md 文件</p></div>
   <div class="info-card"><div class="icon">🔢</div><h4>行号装订线</h4><p>当前行高亮，与编辑区滚动同步</p></div>
   <div class="info-card"><div class="icon">🧘</div><h4>Zen 专注模式</h4><p>工具栏自动隐藏，鼠标移到顶部滑入</p></div>
@@ -90,7 +91,7 @@ body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Micr
 </div>
 
 <footer class="footer">
-  MetonaEditor v0.1.14 ·
+  MetonaEditor v0.1.15 ·
   <a href="index.html">首页</a> ·
   <a href="docs.html">API 文档</a> ·
   <a href="https://git.metona.cn/MetonaTeam/MetonaEditor" target="_blank" rel="noopener">源码仓库</a> · MIT
@@ -135,6 +136,7 @@ var demoMd=[
   '',
   '| 版本 | 日期 | 测试 | 主题 |',
   '| :--- | :---: | ---: | --- |',
+  '| v0.1.15 | 2026-07 | 558 | 三重强调+链接格式+转义+Token分离+块级表驱动 |',
   '| v0.1.14 | 2026-07 | 535+ | 语法高亮+Mermaid+文件系统 |',
   '| v0.1.12 | 2026-07 | 535 | A11y+Zen+滚动同步 |',
   '| v0.1.7 | 2026-07 | 532 | 编辑体验 |',
@@ -174,8 +176,10 @@ var demoMd=[
   '## 🎨 文本样式',
   '',
   '- **粗体** / __另一种粗体__',
+  '- ***粗斜体*** / ___另一种粗斜体___  ← v0.1.15',
   '- *斜体* / _另一种斜体_',
   '- ~~删除线~~ / ==高亮标记==',
+  '- 链接内格式：[**粗体链接**](https://example.com) ← v0.1.15',
   '- 化学：H~2~O / 数学：x^2^',
   '- 代码：`const x = 42;`',
   '- Emoji：:smile: :rocket: :fire: :rainbow: :coffee: :hamburger:',