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/SettingsServerFooter.vue

@@ -0,0 +1,33 @@
+<script setup lang="ts">
+defineProps<{
+  hasChanges: boolean
+  saving: boolean
+}>()
+
+const emit = defineEmits<{
+  save: []
+}>()
+
+const { t } = useI18n()
+</script>
+
+<template>
+  <div class="border-t border-default bg-default px-4 py-4 sm:px-6">
+    <div class="flex items-center justify-end gap-3">
+      <p
+        v-if="hasChanges"
+        class="mr-auto text-xs text-warning"
+      >
+        {{ t('settings.unsavedChanges') }}
+      </p>
+      <UButton
+        :label="t('settings.saveSettings')"
+        icon="i-lucide-save"
+        color="primary"
+        :loading="saving"
+        :disabled="!hasChanges"
+        @click="emit('save')"
+      />
+    </div>
+  </div>
+</template>