fix: 添付ファイルのあるリクエストを受けたときの初動を改善 (#15896)

* wip

* ロールポリシーの値も参照するように

* エンドポイントのテストを追加

* fix review

* add spdx

* fix CHANGELOG.md

* fix test

* regenerate

* add log

* Revert "add log"

This reverts commit 4b2bf59a609b85ca0bfcc9b71438db782f11983d.

* add log

* fix

* Revert "add log"

This reverts commit c5a73d57da0f30ec5215e08a8b4d78785cce48d1.

packages/backend/src/server/ServerService.ts

@@ -73,7 +73,7 @@ export class ServerService implements OnApplicationShutdown {
 	}
 
 	@bindThis
-	public async launch(): Promise<void> {
+	public async launch() {
 		const fastify = Fastify({
 			trustProxy: true,
 			logger: false,
@@ -133,8 +133,8 @@ export class ServerService implements OnApplicationShutdown {
 				reply.header('content-type', 'text/plain; charset=utf-8');
 				reply.header('link', `<${encodeURI(location)}>; rel="canonical"`);
 				done(null, [
-					"Refusing to relay remote ActivityPub object lookup.",
-					"",
+					'Refusing to relay remote ActivityPub object lookup.',
+					'',
 					`Please remove 'application/activity+json' and 'application/ld+json' from the Accept header or fetch using the authoritative URL at ${location}.`,
 				].join('\n'));
 			});
@@ -301,6 +301,7 @@ export class ServerService implements OnApplicationShutdown {
 		}
 
 		await fastify.ready();
+		return fastify;
 	}
 
 	@bindThis