feat: 添加多个附录交互式组件和文档更新

- 添加浏览器前端组件：无障碍访问、国际化、实时通信
- 添加 Transformer 注意力机制系列组件
- 更新 Canvas、数据追踪等现有组件
- 修复 ESLint 变量名冲突问题
- 完善相关附录文档

docs/.vitepress/theme/components/appendix/transformer-attention/PositionalEncodingDemo.vue

@@ -0,0 +1,40 @@
+<template>
+  <div class="demo-card">
+    <div class="pe-content">
+      <div class="problem">
+        <div class="title">问题：词序很重要</div>
+        <div class="examples">
+          <span class="ex">我爱你</span>
+          <span class="vs">≠</span>
+          <span class="ex">你爱我</span>
+        </div>
+      </div>
+      <div class="solution">
+        <div class="title">解决：位置编码</div>
+        <div class="formula">Token Embedding + Positional Encoding</div>
+        <div class="methods">
+          <div class="method">正弦余弦（Transformer 原始）</div>
+          <div class="method">可学习（BERT、GPT）</div>
+          <div class="method">旋转编码 RoPE（LLaMA）</div>
+        </div>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup>
+</script>
+
+<style scoped>
+.demo-card { border: 1px solid var(--vp-c-divider); border-radius: 8px; background: var(--vp-c-bg-soft); padding: 1rem; margin: 1rem 0; }
+.pe-content { display: grid; grid-template-columns: 1fr 1fr; gap: 0.8rem; }
+@media (max-width: 560px) { .pe-content { grid-template-columns: 1fr; } }
+.problem, .solution { background: var(--vp-c-bg); border: 1px solid var(--vp-c-divider); border-radius: 6px; padding: 0.8rem; }
+.title { font-size: 0.8rem; font-weight: bold; color: var(--vp-c-text-1); margin-bottom: 0.5rem; }
+.examples { display: flex; align-items: center; justify-content: center; gap: 0.5rem; }
+.ex { font-size: 0.9rem; font-weight: bold; color: var(--vp-c-text-1); }
+.vs { font-size: 1rem; color: var(--vp-c-brand); }
+.formula { background: var(--vp-c-brand-soft); border: 1px dashed var(--vp-c-brand); border-radius: 4px; padding: 0.5rem; font-size: 0.75rem; color: var(--vp-c-brand); text-align: center; margin-bottom: 0.5rem; font-family: monospace; }
+.methods { display: flex; flex-direction: column; gap: 0.25rem; }
+.method { font-size: 0.7rem; color: var(--vp-c-text-2); background: var(--vp-c-bg-alt); padding: 0.3rem 0.5rem; border-radius: 3px; }
+</style>