feat: 添加项目详情 Markdown 渲染支持及项目添加脚本

- 新增 MarkdownContent 组件支持 Markdown 渲染
- 新增 scripts 目录下的项目添加工具脚本
- 更新项目详情页面支持 Markdown 内容显示
- 更新依赖包支持 Markdown 解析

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/components/project/ProjectDetail.tsx

@@ -1,6 +1,7 @@
 'use client'
 
 import Link from 'next/link'
+import { MarkdownContent } from './MarkdownContent'
 
 interface ProjectDetailProps {
   project: {
@@ -127,18 +128,14 @@ export function ProjectDetail({ project, locale }: ProjectDetailProps) {
       </header>
 
       {/* Article Content */}
-      <article className="prose prose-lg dark:prose-invert max-w-none prose-headings:font-display prose-a:text-blue-600 dark:prose-a:text-blue-400 hover:prose-a:text-blue-800 dark:hover:prose-a:text-blue-300 prose-img:border-2 prose-img:border-black dark:prose-img:border-gray-600 prose-img:shadow-brutal dark:prose-img:shadow-none prose-ul:marker:text-black prose-ul:dark:marker:text-white">
+      <article className="max-w-4xl mx-auto">
         {/* Lead paragraph */}
-        <p className="lead font-display text-xl mb-8">{displayDescription}</p>
+        <p className="lead font-display text-xl mb-8 text-gray-700 dark:text-gray-300">
+          {displayDescription}
+        </p>
 
-        {/* Full content */}
-        {displayContent && (
-          <div
-            dangerouslySetInnerHTML={{
-              __html: displayContent.replace(/\n/g, '<br />'),
-            }}
-          />
-        )}
+        {/* Full content with Markdown rendering */}
+        {displayContent && <MarkdownContent content={displayContent} />}
 
         {/* Installation section if GitHub link exists */}
         {project.links.some((l) => l.type === 'GITHUB') && (