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/SettingsSystemInfo.vue

@@ -0,0 +1,36 @@
+<script setup lang="ts">
+defineProps<{
+  appVersion: string
+  updateAvailable: boolean
+  latestVersion: string | null
+  releaseUrl: string | null
+}>()
+
+const { t } = useI18n()
+</script>
+
+<template>
+  <div class="pl-3">
+    <div class="flex flex-wrap items-center gap-2">
+      <span class="text-sm font-medium text-highlighted">
+        {{ t('settings.systemVersion') }}
+      </span>
+      <UBadge
+        color="neutral"
+        variant="subtle"
+        size="sm"
+      >
+        v{{ appVersion }}
+      </UBadge>
+      <a
+        v-if="updateAvailable && latestVersion"
+        :href="releaseUrl || 'https://github.com/O96u/PicHost/releases'"
+        target="_blank"
+        rel="noopener noreferrer"
+        class="text-xs text-warning hover:underline"
+      >
+        {{ t('settings.updateAvailable', { version: `v${latestVersion}` }) }}
+      </a>
+    </div>
+  </div>
+</template>