refactor: 重构设置、API、图库与存储页面前端结构。

将操作日志并入设置侧栏，补齐检查更新提示与版本接口刷新；拆分各模块组件并修复图库搜索分页变量。

app/components/settings/SettingsSection.vue

@@ -0,0 +1,37 @@
+<script setup lang="ts">
+defineProps<{
+  title: string
+  hint?: string
+}>()
+</script>
+
+<template>
+  <section class="space-y-4">
+    <div class="flex items-start justify-between gap-4">
+      <div class="min-w-0">
+        <div class="flex items-center gap-2">
+          <span
+            class="h-4 w-1 shrink-0 rounded-full bg-primary"
+            aria-hidden="true"
+          />
+          <h2 class="text-sm font-semibold text-highlighted">
+            {{ title }}
+          </h2>
+        </div>
+        <p
+          v-if="hint"
+          class="mt-1.5 pl-3 text-xs leading-relaxed text-muted"
+        >
+          {{ hint }}
+        </p>
+      </div>
+      <div
+        v-if="$slots.action"
+        class="shrink-0"
+      >
+        <slot name="action" />
+      </div>
+    </div>
+    <slot />
+  </section>
+</template>