fix(markdown-to-html): preserve inline code inside bold/emphasis

The `extractText()` helper in `preprocessCjkEmphasis()` only handled
`text` nodes and nodes with `children`. `inlineCode` AST nodes (which
have a `value` but no `children`) fell through to the default empty-
string return, silently dropping their content.

For example `**算出 \`logits\`**` rendered as `<strong>算出 </strong>`
with the code span completely lost.

Add an `inlineCode` branch that wraps the node value in backticks so
the downstream `marked` pass can turn it into a proper `<code>` element.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

skills/baoyu-markdown-to-html/scripts/vendor/baoyu-md/src/renderer.ts

@@ -369,6 +369,7 @@ function preprocessCjkEmphasis(markdown: string): string {
   const tree = processor.parse(markdown);
   const extractText = (node: any): string => {
     if (node.type === "text") return node.value;
+    if (node.type === "inlineCode") return `\`${node.value}\``;
     if (node.children) return node.children.map(extractText).join("");
     return "";
   };