Support Nextcloud 35: raise max-version, add int return type to console commands

[blueforce]

Nextcloud 35 support. Two separate problems, both hit on a production upgrade from 34 to 35.

1. The app is disabled during the core upgrade

appinfo/info.xml declares max-version="34" (also in 0.4.0), so the upgrade to 35 switches the app off. The onlyoffice connector then points at a document server that no longer exists: /apps/documentserver_community/healthcheck returns 404 and documents can't be opened.

→ max-version raised to 35.

2. Every occ command fails once the app is enabled on 35

Symfony Console in Nextcloud 35 declares Command::execute(InputInterface $input, OutputInterface $output): int. The untyped overrides in FlushChanges and Fonts fail when the commands are loaded:

Declaration of OCA\DocumentServer\Command\FlushChanges::execute(Symfony\Component\Console\Input\InputInterface $input, Symfony\Component\Console\Output\OutputInterface $output) must be compatible with Symfony\Component\Console\Command\Command::execute(Symfony\Component\Console\Input\InputInterface $input, Symfony\Component\Console\Output\OutputInterface $output): int

occ loads every app's commands, so this takes down all of occ (exit 255), not just documentserver:*. The web side keeps working (web requests don't load console commands), which makes it easy to miss: the healthcheck is green while occ upgrade, occ maintenance:mode etc. are broken.

→ : int added to both execute() methods. Both already return an int on every path (after the exit-code fix from #398), so there's no runtime change. Related history: #296.

Testing

Running these exact three changes on top of the 0.4.0 release, on a production instance:

• Nextcloud 35.0.0, PHP 8.3.31, LiteSpeed, onlyoffice connector 10.1.2
• Before: app disabled after the upgrade, healthcheck 404. After enabling with only the max-version bump: occ exit 255 with the error above.
• After: app enables, /healthcheck returns true, occ status exits 0, documentserver:flush and documentserver:fonts are registered again, no errors in nextcloud.log.

Not yet verified on 35: a full editor round-trip (open, edit, save). I'll add a comment once that's done.

Side note for anyone landing here: the onlyoffice connector 10.1.2 is only declared for NC ≤ 34. 10.2.0 (33 to 35) is listed in the app store, but its release download currently returns 404, so it can't be installed yet.

🤖 Generated with Claude Code

[chadek]

Provide a well signed-off commit, I'll then merge it and release