feat: comprehensive documentation and demo updates

- Update READMEs and docs across multiple languages
- Enhance interactive demos for Agent, LLM, VLM, Audio, Image Gen, Terminal, and Web Basics
- Add new appendix sections for Database and IDE intros
- Update VitePress config, theme, and utility scripts
- Clean up unused assets and components

docs/.vitepress/theme/components/appendix/vlm-intro/PositionalEmbeddingDemo.vue

@@ -5,7 +5,7 @@
       <div class="grid-wrapper">
         <div class="grid-title">Feature Vectors</div>
         <div class="grid-box feature-grid">
-          <div v-for="n in 9" :key="'f'+n" class="cell feature-cell">V</div>
+          <div v-for="n in 9" :key="'f' + n" class="cell feature-cell">V</div>
         </div>
       </div>
 
@@ -15,7 +15,7 @@
       <div class="grid-wrapper">
         <div class="grid-title">Position Embeddings</div>
         <div class="grid-box pos-grid">
-          <div v-for="n in 9" :key="'p'+n" class="cell pos-cell">{{ n }}</div>
+          <div v-for="n in 9" :key="'p' + n" class="cell pos-cell">{{ n }}</div>
         </div>
       </div>
 
@@ -25,14 +25,16 @@
       <div class="grid-wrapper">
         <div class="grid-title">Input to Transformer</div>
         <div class="grid-box result-grid">
-          <div v-for="n in 9" :key="'r'+n" class="cell result-cell">
-            <span class="v">V</span><span class="plus">+</span><span class="p">{{ n }}</span>
+          <div v-for="n in 9" :key="'r' + n" class="cell result-cell">
+            <span class="v">V</span><span class="plus">+</span
+            ><span class="p">{{ n }}</span>
           </div>
         </div>
       </div>
     </div>
     <div class="caption">
-      位置编码 (Position Embedding) 是一组可学习的向量，直接<b>加</b>在图像特征上。
+      位置编码 (Position Embedding)
+      是一组可学习的向量，直接<b>加</b>在图像特征上。
     </div>
   </div>
 </template>