Automatically remove unused game-file versions

src/lib/server/game-files/http.ts

@@ -2,7 +2,7 @@ import { createReadStream } from 'node:fs';
 import { stat } from 'node:fs/promises';
 import { Readable } from 'node:stream';
 import { json } from '@sveltejs/kit';
-import { getLibraryFile } from './index.js';
+import { getLibraryFile, libraryFilesRetired } from './index.js';
 import { assertRegularPath, parseByteRange } from './storage.js';
 
 export function gameFileError(cause: unknown): Response {
@@ -28,6 +28,7 @@ export async function readGameJson(request: Request, maxBytes = 64 * 1024): Prom
 }
 
 export async function serveGameFile(request: Request, versionId: string, requestedPath: string): Promise<Response> {
+    if (libraryFilesRetired(versionId)) return json({ error: 'These outdated game files have been removed.' }, { status: 410 });
     const file = getLibraryFile(versionId, requestedPath);
     if (!file || file.state !== 'ready') return json({ error: 'File is not in a published manifest.' }, { status: 404 });
     const path = await assertRegularPath(file.storageLocation, file.path);