feat(frontend): 优化弹窗组件架构和用户体验

- 使用 BaseDialog 替代旧版 Modal 组件
- 添加平滑过渡动画和更好的可访问性支持
- 新增 ExportProgressDialog 导出进度弹窗
- 优化所有账号管理和使用记录相关弹窗
- 更新国际化文案，改进用户交互体验
- 精简依赖，减少 package.json 体积

backend/internal/repository/account_repo.go

@@ -186,7 +186,7 @@ func (r *accountRepository) BatchUpdateLastUsed(ctx context.Context, updates map
 		ids = append(ids, id)
 	}
 
-	caseSql += " END WHERE id IN ?"
+	caseSql += " END WHERE id IN ? AND deleted_at IS NULL"
 	args = append(args, ids)
 
 	return r.db.WithContext(ctx).Exec(caseSql, args...).Error

backend/internal/repository/proxy_repo.go

@@ -119,6 +119,7 @@ func (r *proxyRepository) CountAccountsByProxyID(ctx context.Context, proxyID in
 	var count int64
 	err := r.db.WithContext(ctx).Table("accounts").
 		Where("proxy_id = ?", proxyID).
+		Where("deleted_at IS NULL").
 		Count(&count).Error
 	return count, err
 }
@@ -134,6 +135,7 @@ func (r *proxyRepository) GetAccountCountsForProxies(ctx context.Context) (map[i
 		Table("accounts").
 		Select("proxy_id, COUNT(*) as count").
 		Where("proxy_id IS NOT NULL").
+		Where("deleted_at IS NULL").
 		Group("proxy_id").
 		Scan(&results).Error
 	if err != nil {

backend/internal/repository/usage_log_repo.go

@@ -182,6 +182,7 @@ func (r *usageLogRepository) GetDashboardStats(ctx context.Context) (*DashboardS
 			COUNT(CASE WHEN rate_limited_at IS NOT NULL AND rate_limit_reset_at > ? THEN 1 END) as ratelimit_accounts,
 			COUNT(CASE WHEN overload_until IS NOT NULL AND overload_until > ? THEN 1 END) as overload_accounts
 		FROM accounts
+		WHERE deleted_at IS NULL
 	`, service.StatusActive, service.StatusError, now, now).Scan(&accountStats).Error; err != nil {
 		return nil, err
 	}