feat(tenant): 添加租户名称重复验证

- 在创建租户时检查名称是否已存在
- 确保租户名称不为空
- 防止重复租户名称导致的数据冲突

src/main/java/com/gxwebsoft/common/system/controller/MainController.java

@@ -673,6 +673,21 @@ public class MainController extends BaseController {
     if (userService.getAdminByPhone(param) != null) {
       throw new BusinessException("该手机号码已注册");
     }
+
+    // 验证租户名称是否重复
+    if (StrUtil.isNotBlank(tenantName)) {
+      long existingTenantCount = tenantService.count(
+        new LambdaQueryWrapper<Tenant>()
+          .eq(Tenant::getTenantName, tenantName)
+          .eq(Tenant::getDeleted, 0)
+      );
+      if (existingTenantCount > 0) {
+        throw new BusinessException("租户名称已存在，请使用其他名称");
+      }
+    } else {
+      throw new BusinessException("租户名称不能为空");
+    }
+
     // 添加租户
     Tenant tenant = new Tenant();
     tenant.setTenantName(tenantName);
@@ -823,6 +838,21 @@ public class MainController extends BaseController {
     if (userService.getAdminByPhone(param) != null) {
       throw new BusinessException("该手机号码已注册");
     }
+
+    // 验证租户名称是否重复
+    if (StrUtil.isNotBlank(tenantName)) {
+      long existingTenantCount = tenantService.count(
+        new LambdaQueryWrapper<Tenant>()
+          .eq(Tenant::getTenantName, tenantName)
+          .eq(Tenant::getDeleted, 0)
+      );
+      if (existingTenantCount > 0) {
+        throw new BusinessException("租户名称已存在，请使用其他名称");
+      }
+    } else {
+      throw new BusinessException("租户名称不能为空");
+    }
+
     // 添加租户
     Tenant tenant = new Tenant();
     tenant.setTenantName(tenantName);