Revert "refactor: 清理租户API旧模块代码"

This reverts commit 992930a821.

src/Infrastructure/TakeoutSaaS.Infrastructure/Identity/Persistence/EfMiniUserRepository.cs

@@ -0,0 +1,70 @@
+using Microsoft.EntityFrameworkCore;
+using TakeoutSaaS.Domain.Identity.Entities;
+using TakeoutSaaS.Domain.Identity.Repositories;
+
+namespace TakeoutSaaS.Infrastructure.Identity.Persistence;
+
+/// <summary>
+/// EF Core 小程序用户仓储实现。
+/// </summary>
+public sealed class EfMiniUserRepository(IdentityDbContext dbContext) : IMiniUserRepository
+{
+    /// <summary>
+    /// 根据 OpenId 获取小程序用户。
+    /// </summary>
+    /// <param name="openId">微信 OpenId。</param>
+    /// <param name="cancellationToken">取消标记。</param>
+    /// <returns>匹配的小程序用户或 null。</returns>
+    public Task<MiniUser?> FindByOpenIdAsync(string openId, CancellationToken cancellationToken = default)
+        => dbContext.MiniUsers.AsNoTracking().FirstOrDefaultAsync(x => x.OpenId == openId, cancellationToken);
+
+    /// <summary>
+    /// 根据用户 ID 获取小程序用户。
+    /// </summary>
+    /// <param name="id">用户 ID。</param>
+    /// <param name="cancellationToken">取消标记。</param>
+    /// <returns>匹配的小程序用户或 null。</returns>
+    public Task<MiniUser?> FindByIdAsync(long id, CancellationToken cancellationToken = default)
+        => dbContext.MiniUsers.AsNoTracking().FirstOrDefaultAsync(x => x.Id == id, cancellationToken);
+
+    /// <summary>
+    /// 创建或更新小程序用户信息。
+    /// </summary>
+    /// <param name="openId">微信 OpenId。</param>
+    /// <param name="unionId">微信 UnionId。</param>
+    /// <param name="nickname">昵称。</param>
+    /// <param name="avatar">头像地址。</param>
+    /// <param name="tenantId">租户 ID。</param>
+    /// <param name="cancellationToken">取消标记。</param>
+    /// <returns>创建或更新后的小程序用户。</returns>
+    public async Task<MiniUser> CreateOrUpdateAsync(string openId, string? unionId, string? nickname, string? avatar, long tenantId, CancellationToken cancellationToken = default)
+    {
+        // 1. 查询现有用户
+        var user = await dbContext.MiniUsers.FirstOrDefaultAsync(x => x.OpenId == openId, cancellationToken);
+        if (user == null)
+        {
+            // 2. 未找到则创建
+            user = new MiniUser
+            {
+                Id = 0,
+                OpenId = openId,
+                UnionId = unionId,
+                Nickname = nickname ?? "小程序用户",
+                Avatar = avatar,
+                TenantId = tenantId
+            };
+            dbContext.MiniUsers.Add(user);
+        }
+        else
+        {
+            // 3. 已存在则更新可变字段
+            user.UnionId = unionId ?? user.UnionId;
+            user.Nickname = nickname ?? user.Nickname;
+            user.Avatar = avatar ?? user.Avatar;
+        }
+
+        // 4. 保存更改
+        await dbContext.SaveChangesAsync(cancellationToken);
+        return user;
+    }
+}