refactor(core): migrate to Bun and converge acquisition policies and Agent boundaries

apps/server/test/sources-identity/snapshot-deadline.test.ts

@@ -18,7 +18,10 @@ describe.skipIf(!up)("快照截止时间", () => {
   let h: Harness;
   let siteId: string;
   // 永不返回,也不理会 signal
-  const hang = (() => new Promise<Response>(() => {})) as typeof fetch;
+  const hang = (() => new Promise<Response>(() => {})) as (
+    input: RequestInfo | URL,
+    init?: RequestInit,
+  ) => Promise<Response>;
 
   beforeAll(async () => {
     h = await createHarness("snapdeadline", { fetch: hang });