fix: 修复配额说明重复和undefined问题

- 在editStorageForm中初始化oss_storage_quota_value和oss_quota_unit
- 删除重复的旧配额说明块，保留新的当前配额设置显示

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

backend/check_expire.sql

@@ -0,0 +1,19 @@
+SELECT 
+  share_code,
+  substr(share_path, 1, 30) as path,
+  created_at,
+  expires_at,
+  datetime('now') as current_time,
+  CASE 
+    WHEN expires_at IS NULL THEN '永久有效'
+    WHEN expires_at > datetime('now') THEN '未过期'
+    ELSE '已过期'
+  END as status,
+  CASE 
+    WHEN expires_at IS NOT NULL AND expires_at > datetime('now') THEN '通过'
+    WHEN expires_at IS NULL THEN '通过'
+    ELSE '拦截'
+  END as findByCode_result
+FROM shares
+ORDER BY created_at DESC
+LIMIT 10;