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/support/engine.ts

@@ -0,0 +1,48 @@
+// 只记录入队、不执行的假引擎(处理器由测试直接调服务函数)。
+import { randomUUID } from "node:crypto";
+import type { TaskEngine } from "@umt/tasks";
+
+export interface Enqueued {
+  task: string;
+  input: unknown;
+  key: string;
+}
+
+/**
+ * dedupe:同一幂等键只记一次并返回 deduplicated(贴近真实引擎);缺省每次都记,runId 为 run-1、run-2…
+ */
+export function fakeEngine(opts: { dedupe?: boolean } = {}): TaskEngine & { enqueued: Enqueued[] } {
+  const enqueued: Enqueued[] = [];
+  const keys = new Set<string>();
+  let n = 0;
+  return {
+    enqueued,
+    async enqueue(task, input, o) {
+      if (opts.dedupe) {
+        const dup = keys.has(o.idempotencyKey);
+        if (!dup) {
+          keys.add(o.idempotencyKey);
+          enqueued.push({ task, input, key: o.idempotencyKey });
+        }
+        return { runId: randomUUID(), deduplicated: dup };
+      }
+      enqueued.push({ task, input, key: o.idempotencyKey });
+      n++;
+      return { runId: `run-${n}`, deduplicated: false };
+    },
+    async signal() {
+      return { delivered: 0 };
+    },
+    async cancel() {
+      return false;
+    },
+    async get() {
+      return null;
+    },
+    async list() {
+      return [];
+    },
+    async startWorker() {},
+    async stop() {},
+  };
+}