style(app): 使用 NuxtImg 替代 img 标签

在多个组件中将 `img` 标签替换为 `NuxtImg` 标签，提升图片加载的性能和优化。例如，在 `AboutSection.vue`、`FriendsSection.vue`、`HeroSection.vue`、`ProjectsSection.vue`、`SitesSection.vue` 和 `SkillsSection.vue` 中的图片标签。

refactor(app): 扩展 `nuxt.config.ts` 配置

扩展了 `nuxt.config.ts` 配置文件中的模块配置，添加了 `@nuxt/image` 和 `@nuxt/eslint` 模块。同时，优化了 `routeRules` 配置，以支持预渲染和增量静态生成。

app/components/SkillsSection.vue

@@ -5,15 +5,18 @@
             <p class="text-text-muted text-sm m-0 mb-3">我常用的工具与技术 · Skills & Technologies</p>
         </div>
         <div class="grid grid-cols-1 sm:grid-cols-2 gap-3">
-            <article v-for="group in skills" :key="group.title"
+            <article
+v-for="group in skills" :key="group.title"
                 class="bg-gradient-to-br from-white/5 to-white/2 border border-white/10 rounded-2xl p-3.5 shadow-md-dark transition-all duration-300 hover:-translate-y-1 hover:border-primary/50 hover:shadow-lg-dark hover:bg-gradient-to-br hover:from-primary/8">
                 <header class="mb-3">
                     <h3 class="text-base font-semibold m-0">{{ group.title }}</h3>
                 </header>
                 <div class="flex flex-wrap gap-2">
-                    <span v-for="item in group.items" :key="item"
+                    <span
+v-for="item in group.items" :key="item"
                         class="inline-flex items-center p-1.5 rounded-2xl bg-primary/14 border border-primary/18 transition-all duration-200 hover:bg-primary/24 hover:border-primary/40 hover:scale-110">
-                        <img :src="iconSrc(item)" :alt="item" :title="item" loading="lazy"
+                        <NuxtImg
+:src="iconSrc(item)" :alt="item" :title="item" loading="lazy"
                             class="w-7 h-7 rounded-2xl" />
                     </span>
                 </div>