fix : 테이블 추가 및 수정

- 신규 (user_roles, user_tenants)
- 수정 (roles, tenants, users)

app/Models/Role.php

@@ -14,4 +14,14 @@ public function menuPermissions()
     {
         return $this->hasMany(RoleMenuPermission::class, 'role_id');
     }
+
+    public function tenant()
+    {
+        return $this->belongsTo(Tenant::class);
+    }
+
+    public function userRoles()
+    {
+        return $this->hasMany(UserRole::class);
+    }
 }