test: server 测试共用建库与假引擎,sse-pg 归入串行组

- 新增 apps/server/test/support/{pg,engine}.ts:测试库地址、可用性探测、schema 咨询锁、
  建 schema + 加锁迁移 + 删除、可选去重的假引擎;6 份 harness 改用它(acquisition-organize 与
  file-manager 原先迁移不加锁,并行下有冲突隐患,一并修正)
- sse-pg 起子进程,并行下子进程启动超时,归入 serial
- 修正 b61335e 挪动 / 改名测试后遗留的 import 排序与格式(当时 lint 检查经管道被吞掉退出码)

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/server/test/inventory/media-servers.test.ts

@@ -1,11 +1,6 @@
 import { afterAll, beforeAll, describe, expect, it } from "vitest";
-import {
-  createHarness,
-  type Harness,
-  pgAvailable,
-  seedEntity,
-} from "../acquisition-organize/harness.ts";
 import { MEDIA_SERVER_LIMITS } from "../../src/modules/acquisition-organize/routes/library.ts";
+import { createHarness, type Harness, pgAvailable, seedEntity } from "../acquisition-organize/harness.ts";
 
 // C1-D:GET /inventory/media-servers 按实例并行(allSettled)+ 实例内并发上限 + 整实例超时;部分失败 partial=true。