refactor(Container): simplify container component and remove size prop

Remove size variants from Container component and set a default max-width
Update all instances where Container was used with size prop to use default

src/pages/zh/blog/index.astro

@@ -56,7 +56,7 @@ const tags = extractTags(allPostsArray);
 <BlogLayout title="博客 - 赵桂阳" description="深入我对编程、技术趋势和开发者生活的思考。探索我的最新文章。">
   <main class="min-h-screen">
     <!-- 头部区域 -->
-    <Container client:load size="md" className="pt-24 pb-12">
+    <Container client:load className="pt-24 pb-12">
       <div class="text-center mb-16">
         <h1 class="text-5xl md:text-6xl font-bold bg-gradient-to-r from-foreground via-purple-600 to-purple-800 dark:from-foreground dark:via-purple-200 dark:to-purple-300 bg-clip-text text-transparent mb-6">
           我的<span class="text-purple-500">博客</span>
@@ -68,7 +68,7 @@ const tags = extractTags(allPostsArray);
     </Container>
 
     <!-- 主要内容 -->
-    <Container client:load size="md" className="pb-20">
+    <Container client:load className="pb-20">
       <div class="grid grid-cols-1 lg:grid-cols-4 gap-8">
         <!-- 侧边栏 -->
         <div class="lg:col-span-1 space-y-8">