style: 优化配额设置界面布局

将配额说明移动到OSS配额设置下方，界面更整洁

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/app.html

@@ -3125,6 +3125,18 @@
               <option value="MB">MB</option>
             </select>
           </div>
+          <small style="color: var(--text-secondary); font-size: 12px; margin-top: 5px; display: block;">
+            0 = 无限制 | 配额范围: 0 - 100TB
+          </small>
+        </div>
+
+        <!-- 配额说明 -->
+        <div style="padding: 12px; background: rgba(255,255,255,0.03); border-radius: 6px; margin-bottom: 20px;">
+          <div style="font-size: 13px; color: var(--text-secondary); line-height: 1.6;">
+            <strong style="color: var(--text-primary);">当前配额设置:</strong><br>
+            • 本地存储: {{ editStorageForm.local_storage_quota_value }} {{ editStorageForm.quota_unit }}<br>
+            • OSS存储: {{ editStorageForm.oss_storage_quota_value === 0 ? "无限制" : editStorageForm.oss_storage_quota_value + " " + editStorageForm.oss_quota_unit }}
+          </div>
         </div>
 
         <div style="display: flex; gap: 10px; margin-top: 20px;">