feat: 后台管理新增 UpdateRealnameMode 接口并注册路由 PATCH /api/admin/assets/:identifier/realname-mode

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

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

internal/routes/asset.go

@@ -118,4 +118,13 @@ func registerAssetRoutes(router fiber.Router, handler *admin.AssetHandler, walle
 		Output:      new(dto.UpdateAssetPollingStatusResponse),
 		Auth:        true,
 	})
+
+	Register(assets, doc, groupPath, "PATCH", "/:identifier/realname-mode", handler.UpdateRealnamePolicy, RouteSpec{
+		Summary:     "更新资产实名认证策略",
+		Description: "更新指定资产（IoT卡或设备）的实名认证策略，支持 none/before_order/after_order 三种模式。",
+		Tags:        []string{"资产管理"},
+		Input:       new(dto.UpdateAssetRealnamePolicyRequest),
+		Output:      new(dto.UpdateAssetRealnamePolicyResponse),
+		Auth:        true,
+	})
 }