fix(仓储): 修复查询关闭错误并迁移集成测试

修复 rows.Close 失败时的错误返回逻辑
迁移网关路由集成测试到 ent 事务基建
补齐仓储接口变更对应的测试桩方法
新增 backend/Makefile 统一测试命令
测试: GOTOOLCHAIN=go1.24.11 go test ./...
测试: golangci-lint run ./... --timeout=5m
测试: make test-integration

backend/ent/schema/mixins/soft_delete.go

@@ -7,12 +7,12 @@ import (
 	"fmt"
 	"time"
 
-	"github.com/Wei-Shaw/sub2api/ent/intercept"
 	"entgo.io/ent"
 	"entgo.io/ent/dialect"
 	"entgo.io/ent/dialect/sql"
 	"entgo.io/ent/schema/field"
 	"entgo.io/ent/schema/mixin"
+	"github.com/Wei-Shaw/sub2api/ent/intercept"
 )
 
 // SoftDeleteMixin 实现基于 deleted_at 时间戳的软删除功能。