feat: 优化 /life 页面样式和图片显示

- 优化 /life 列表页视觉设计，增加主题标签、背景装饰、卡片动效
- 修复列表页精选文章图片显示
- 优化文章详情页图片画廊，支持切换和计数显示
- 保持整体风格一致性（米白背景 + 深灰文字 + 绿色强调）

src/app/life/[slug]/page.tsx

@@ -0,0 +1,45 @@
+import type { Metadata } from "next";
+import { notFound } from "next/navigation";
+import { LifeArticlePage } from "@/components/life-article-page";
+import { lifePosts, getLifePost } from "@/content/life/posts";
+
+type PageProps = {
+  params: Promise<{
+    slug: string;
+  }>;
+};
+
+export function generateStaticParams() {
+  return lifePosts.map((post) => ({ slug: post.slug }));
+}
+
+export async function generateMetadata({ params }: PageProps): Promise<Metadata> {
+  const { slug } = await params;
+  const post = getLifePost(slug);
+
+  if (!post) {
+    return {
+      title: "文章未找到 | fly",
+    };
+  }
+
+  return {
+    title: `${post.title} | fly 日常分享`,
+    description: post.description,
+  };
+}
+
+export default async function LifeArticlePageRoute({ params }: PageProps) {
+  const { slug } = await params;
+  const post = getLifePost(slug);
+
+  if (!post) {
+    notFound();
+  }
+
+  const currentIndex = lifePosts.findIndex((p) => p.slug === slug);
+  const prevPost = currentIndex > 0 ? lifePosts[currentIndex - 1] : undefined;
+  const nextPost = currentIndex < lifePosts.length - 1 ? lifePosts[currentIndex + 1] : undefined;
+
+  return <LifeArticlePage post={post} prevPost={prevPost} nextPost={nextPost} />;
+}

src/app/life/page.tsx

@@ -1,12 +1,12 @@
-import { PlaceholderPage } from "@/components/placeholder-page";
+import type { Metadata } from "next";
+import { LifePage } from "@/components/life-page";
+import { lifePosts } from "@/content/life/posts";
 
-export default function LifePage() {
-  return (
-    <PlaceholderPage
-      eyebrow="Life journal"
-      title="生活分享"
-      description="技术之外的个人切面：日常、阅读、音乐、照片、旅行，以及阶段性的想法。"
-      items={["日常记录", "阅读和音乐", "照片和旅行", "一些想法"]}
-    />
-  );
+export const metadata: Metadata = {
+  title: "日常分享 | fly",
+  description: "fly 的日常分享，记录生活片段、照片和阶段性的想法。",
+};
+
+export default function LifeIndexPage() {
+  return <LifePage posts={lifePosts} />;
 }