feat(tenant): 完善用户注册时tenantId的自动填充逻辑

- 在RegisterUserDTO中新增tenantId字段用于接收前端传入的租户ID
- 修改SysUserServiceImpl中用户注册逻辑，支持自动继承当前登录用户的tenantId
- 调整SysUserMapper.xml查询条件，允许查询未分配tenantId的用户

pigx-upms/pigx-upms-api/src/main/java/com/pig4cloud/pigx/admin/api/dto/RegisterUserDTO.java

@@ -30,4 +30,9 @@ public class RegisterUserDTO {
      * 电话
      */
     private String phone;
+
+    /**
+     * 租户ID
+     */
+    private Long tenantId;
 }

pigx-upms/pigx-upms-biz/src/main/java/com/pig4cloud/pigx/admin/service/impl/SysUserServiceImpl.java

@@ -156,7 +156,8 @@ public class SysUserServiceImpl extends ServiceImpl<SysUserMapper, SysUser> impl
         // 插入用户租户关系表
         SysTenantUser sysTenantUser = new SysTenantUser();
         sysTenantUser.setUserId(sysUser.getUserId());
-        sysTenantUser.setTenantId(SecurityUtils.getUser().getTenantId());
+        sysTenantUser.setTenantId(Objects.nonNull(SecurityUtils.getUser())
+                ? SecurityUtils.getUser().getTenantId() : userDto.getTenantId());
         sysTenantUserMapper.insert(sysTenantUser);
         return Boolean.TRUE;
     }

pigx-upms/pigx-upms-biz/src/main/resources/mapper/SysUserMapper.xml

@@ -111,9 +111,9 @@
         <include refid="userColumns"/>
         FROM
         sys_user u
-        INNER JOIN sys_user_dept ud ON u.user_id = ud.user_id
+        LEFT JOIN sys_user_dept ud ON u.user_id = ud.user_id
         WHERE
-        ud.tenant_id = #{query.tenantId}
+        ud.tenant_id = #{query.tenantId} OR ud.tenant_id IS NULL
         AND u.del_flag = '0'
         <!-- 用户名模糊查询 -->
             <if test="query.username != null and query.username != ''">
@@ -138,9 +138,9 @@
         <include refid="userColumns"/>
         FROM
         sys_user u
-        INNER JOIN sys_user_dept ud ON u.user_id = ud.user_id
+        LEFT JOIN sys_user_dept ud ON u.user_id = ud.user_id
         WHERE
-        ud.tenant_id = #{query.tenantId}
+        ud.tenant_id = #{query.tenantId} OR ud.tenant_id IS NULL
         AND u.del_flag = '0'
         <!-- 用户名模糊查询 -->
             <if test="query.username != null and query.username != ''">