Revert "refactor: 清理租户API旧模块代码"

This reverts commit 992930a821.

src/Domain/TakeoutSaaS.Domain/SystemParameters/Repositories/ISystemParameterRepository.cs

@@ -0,0 +1,65 @@
+using TakeoutSaaS.Domain.SystemParameters.Entities;
+
+namespace TakeoutSaaS.Domain.SystemParameters.Repositories;
+
+/// <summary>
+/// 系统参数仓储接口：提供基础 CRUD 与查询能力。
+/// </summary>
+public interface ISystemParameterRepository
+{
+    /// <summary>
+    /// 根据标识获取系统参数。
+    /// </summary>
+    /// <param name="id">参数 ID。</param>
+    /// <param name="cancellationToken">取消标记。</param>
+    /// <returns>系统参数或 null。</returns>
+    Task<SystemParameter?> FindByIdAsync(long id, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// 根据键获取系统参数（当前租户）。
+    /// </summary>
+    /// <param name="key">参数键。</param>
+    /// <param name="cancellationToken">取消标记。</param>
+    /// <returns>系统参数或 null。</returns>
+    Task<SystemParameter?> FindByKeyAsync(string key, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// 查询系统参数列表。
+    /// </summary>
+    /// <param name="keyword">关键字。</param>
+    /// <param name="isEnabled">启用状态。</param>
+    /// <param name="cancellationToken">取消标记。</param>
+    /// <returns>参数列表。</returns>
+    Task<IReadOnlyList<SystemParameter>> SearchAsync(string? keyword, bool? isEnabled, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// 新增系统参数。
+    /// </summary>
+    /// <param name="parameter">参数实体。</param>
+    /// <param name="cancellationToken">取消标记。</param>
+    /// <returns>异步任务。</returns>
+    Task AddAsync(SystemParameter parameter, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// 删除系统参数。
+    /// </summary>
+    /// <param name="parameter">参数实体。</param>
+    /// <param name="cancellationToken">取消标记。</param>
+    /// <returns>异步任务。</returns>
+    Task RemoveAsync(SystemParameter parameter, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// 更新系统参数。
+    /// </summary>
+    /// <param name="parameter">参数实体。</param>
+    /// <param name="cancellationToken">取消标记。</param>
+    /// <returns>异步任务。</returns>
+    Task UpdateAsync(SystemParameter parameter, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// 持久化更改。
+    /// </summary>
+    /// <param name="cancellationToken">取消标记。</param>
+    /// <returns>异步任务。</returns>
+    Task SaveChangesAsync(CancellationToken cancellationToken = default);
+}