feat(markdown): 添加GitHub风格警告支持

实现GitHub风格警告块([!NOTE], [!TIP]等)到标准容器指令的转换
更新astro配置使用自定义插件

astro.config.mjs

@@ -14,7 +14,7 @@ import rehypeExternalLinks from "rehype-external-links";
 import rehypeKatex from "rehype-katex";
 import rehypeSlug from "rehype-slug";
 import remarkDirective from "remark-directive"; /* Handle directives */
-import remarkGithubAdmonitionsToDirectives from "remark-github-admonitions-to-directives";
+import { remarkGithubAdmonitions } from "./src/plugins/remark-github-admonitions.js";
 import remarkMath from "remark-math";
 import remarkSectionize from "remark-sectionize";
 import { imageFallbackConfig, siteConfig } from "./src/config.ts";
@@ -122,7 +122,7 @@ export default defineConfig({
 			remarkMath,
 			remarkReadingTime,
 			remarkExcerpt,
-			remarkGithubAdmonitionsToDirectives,
+			remarkGithubAdmonitions,
 			remarkDirective,
 			remarkSectionize,
 			parseDirectiveNode,

src/plugins/remark-github-admonitions.js

@@ -0,0 +1,48 @@
+import { visit } from 'unist-util-visit';
+
+export function remarkGithubAdmonitions() {
+  return (tree) => {
+    visit(tree, 'blockquote', (node, index, parent) => {
+      const children = node.children;
+      if (!children || children.length === 0) return;
+
+      const firstChild = children[0];
+      if (firstChild.type !== 'paragraph') return;
+
+      const firstTextNode = firstChild.children[0];
+      if (!firstTextNode || firstTextNode.type !== 'text') return;
+
+      const text = firstTextNode.value;
+      // Match [!TYPE] at the start of the text, allowing for optional whitespace
+      const match = text.match(/^\[!(NOTE|TIP|IMPORTANT|WARNING|CAUTION)\]/i);
+
+      if (match) {
+        const type = match[1].toLowerCase();
+        
+        // Remove the [!TYPE] text
+        let newFirstTextValue = text.slice(match[0].length);
+        
+        // If there's a newline or space immediately after, trim it
+        if (newFirstTextValue.startsWith('\n') || newFirstTextValue.startsWith(' ')) {
+            newFirstTextValue = newFirstTextValue.slice(1);
+        }
+
+        // Update the text node
+        firstTextNode.value = newFirstTextValue;
+        
+        // If the first paragraph becomes empty (just whitespace), remove it
+        if (newFirstTextValue.trim() === '' && firstChild.children.length === 1) {
+             node.children.shift();
+        }
+
+        // Transform the node to containerDirective
+        node.type = 'containerDirective';
+        node.name = type;
+        node.attributes = {};
+        
+        // Ensure data exists
+        node.data = node.data || {};
+      }
+    });
+  };
+}