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/Makefile

@@ -0,0 +1,13 @@
+.PHONY: build test-unit test-integration test-e2e
+
+build:
+	go build -o bin/server ./cmd/server
+
+test-unit:
+	go test -tags=unit ./...
+
+test-integration:
+	go test -tags=integration ./...
+
+test-e2e:
+	go test -tags=e2e ./...