feat: API Keys页面恢复今日时间选项并设为默认

- 添加"今日"时间筛选选项，使用fa-calendar-day图标
- 将默认时间范围从"最近7天"改为"今日"
- 优化日期处理逻辑，确保今日选项从0点开始
- 调整UsageDetailModal宽度以适应内容显示
- 同步更新所有相关的初始化和重置逻辑

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

web/admin-spa/src/components/apikeys/UsageDetailModal.vue

@@ -6,7 +6,7 @@
 
       <!-- 模态框 -->
       <div
-        class="modal-content relative mx-auto flex max-h-[90vh] w-[95%] max-w-2xl flex-col p-4 sm:w-full sm:max-w-3xl sm:p-6 md:p-8"
+        class="modal-content relative mx-auto flex max-h-[90vh] w-[95%] max-w-5xl flex-col p-4 sm:w-full sm:p-6 md:p-8"
       >
         <!-- 标题栏 -->
         <div class="mb-4 flex items-center justify-between sm:mb-6">