fix: add Nextcloud 34 support

[Git-Usr123]

Summary

Fixes compatibility with Nextcloud 32–34 which introduced several breaking changes.

PHP backend (OccController.php)

• Replace deprecated OC::$server->getConfig() (removed in NC34) with OC::$server->get(\OCP\IConfig::class)

Frontend

• Bundle jQuery 3.7.1 — Nextcloud dropped its bundled jQuery in NC32, causing a blank/black terminal window
• Fix script load order in template: jQuery must load before the terminal plugin and index.js
• Add OC.requestToken to all AJAX requests via $.ajaxSetup() — without NC's jQuery integration, CSRF tokens were no longer injected automatically, causing 412 errors on all API calls

Compatibility

• Bump max-version from 31 to 34 in info.xml
• Bump version to 0.2.4

[Git-Usr123]

Still working on: [Nextcloud Hub 26 Spring] (34.0.1)

[davie2000]

with this corrections occweb is working again with 34.0.1.
Thank you!

[rodnand]

This fixes occweb with Nextcloud 34.0.1 for me, too. Thank you very much!

[TomBraider42]

Works for me too, thanks!

[Fuseteam]

@Adphi we got number of confirmations that this keeps it working on nextcloud 34

[Fuseteam]

tho @Git-Usr123 you might want to keep the fork notice out of this PR