feat(auth): 角色管理新增分配用户后端方法(assignUsers+toggleUser)

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

extend/base/admin/controller/system/AuthBase.php

@@ -2,14 +2,17 @@
 
 namespace base\admin\controller\system;
 
+use app\admin\model\SystemAdmin;
 use app\admin\model\SystemAuth;
 use app\admin\model\SystemAuthNode;
 use app\admin\service\annotation\ControllerAnnotation;
 use app\admin\service\annotation\NodeAnotation;
 use app\admin\service\NodeService;
 use app\admin\service\TriggerService;
+use app\common\constants\AdminConstant;
 use app\common\controller\AdminController;
 use think\App;
+use think\facade\Db;
 
 /**
  * @ControllerAnnotation(title="角色权限管理")
@@ -95,4 +98,88 @@ class AuthBase extends AdminController
         }
         $this->success('保存成功');
     }
+
+    /**
+     * @NodeAnotation(title="分配用户")
+     */
+    public function assignUsers($id)
+    {
+        $row = $this->model->find($id);
+        empty($row) && $this->error('数据不存在');
+
+        if ($this->request->isAjax()) {
+            list($page, $limit, $where) = $this->buildTableParames();
+            $count = SystemAdmin::where($where)
+                ->where('delete_time', 0)
+                ->count();
+            $list = SystemAdmin::where($where)
+                ->withoutField('password')
+                ->fieldRaw('FIND_IN_SET(' . intval($id) . ', auth_ids) AS has_role')
+                ->where('delete_time', 0)
+                ->page($page, $limit)
+                ->order('id desc')
+                ->select();
+            $data = [
+                'code' => 0,
+                'msg' => '',
+                'count' => $count,
+                'data' => $list,
+            ];
+
+            return json($data);
+        }
+
+        $this->assign('row', $row);
+
+        return $this->fetch();
+    }
+
+    /**
+     * @NodeAnotation(title="分配用户切换")
+     */
+    public function toggleUser()
+    {
+        $this->checkPostRequest();
+        $userId = intval($this->request->post('user_id'));
+        $roleId = intval($this->request->post('role_id'));
+
+        if ($userId == AdminConstant::SUPER_ADMIN_ID) {
+            $this->error('超级管理员不支持此操作');
+        }
+
+        $user = SystemAdmin::find($userId);
+        if (empty($user)) {
+            $this->error('用户不存在');
+        }
+        $role = SystemAuth::where('id', $roleId)->where('delete_time', 0)->find();
+        if (empty($role)) {
+            $this->error('角色不存在');
+        }
+
+        Db::startTrans();
+        try {
+            // FOR UPDATE 行锁，防止并发下读-改-写丢失逗号串的其它角色
+            $userRow = Db::name('system_admin')->where('id', $userId)->lock(true)->find();
+            $existing = empty($userRow['auth_ids']) ? [] : array_filter(explode(',', $userRow['auth_ids']));
+            $existing = array_values(array_map('strval', $existing));
+            $roleIdStr = (string) $roleId;
+            if (in_array($roleIdStr, $existing)) {
+                // 撤回：仅移除该角色，保留其它角色
+                $newArr = array_values(array_diff($existing, [$roleIdStr]));
+            } else {
+                // 分配：新增该角色，保留其它角色
+                $newArr = array_values(array_unique(array_merge($existing, [$roleIdStr])));
+            }
+            Db::name('system_admin')->where('id', $userId)->update([
+                'auth_ids' => empty($newArr) ? '' : implode(',', $newArr),
+            ]);
+            Db::commit();
+        } catch (\Exception $e) {
+            Db::rollback();
+            $this->error('操作失败：' . $e->getMessage());
+        }
+
+        TriggerService::updateMenu($userId);
+        $this->success('操作成功');
+    }
 }