docs(swagger): document brand order endpoint

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

server/internal/shared/swagger/descriptions.go

@@ -333,6 +333,7 @@ var routeDocs = map[string]routeDoc{
 	"GET /api/tenant/brands":                 {"品牌列表", "返回当前 Workspace 下的品牌列表。"},
 	"GET /api/tenant/brands/library-summary": {"品牌库概览", "品牌、关键词、问题、竞品的总数与最近变更。"},
 	"POST /api/tenant/brands":                {"新建品牌", "创建一个新品牌。"},
+	"PUT /api/tenant/brands/order":           {"调整品牌排序", "按提交的品牌 ID 顺序更新当前 Workspace 下全部活跃品牌的展示顺序。"},
 	"GET /api/tenant/brands/:id":             {"品牌详情", "返回品牌基础信息及统计。"},
 	"PUT /api/tenant/brands/:id":             {"更新品牌", "更新品牌名称、行业、官网等。"},
 	"DELETE /api/tenant/brands/:id":          {"删除品牌", "标记品牌删除并由后台任务静默清理其文章、词库、竞品和采集数据；发布记录保留在用户发文总账。"},