refactor: maintenanceStatus -> getMaintenanceStatus

refactor: `integrityCheck` -> `detectPriorInstall`
chore: add `v2.4.0` version
refactor: `/backups/list` -> `/backups`
refactor: use sendFile in download route
refactor: use separate backups permissions
chore: correct descriptions
refactor: permit handler that doesn't return promise for sendfile

server/src/utils/file.ts

@@ -42,7 +42,7 @@ const cacheControlHeaders: Record<CacheControl, string | null> = {
 export const sendFile = async (
   res: Response,
   next: NextFunction,
-  handler: () => Promise<ImmichFileResponse>,
+  handler: () => Promise<ImmichFileResponse> | ImmichFileResponse,
   logger: LoggingRepository,
 ): Promise<void> => {
   // promisified version of 'res.sendFile' for cleaner async handling