Fix Internal Server Error from OC\Server::getL10NFactory() when app navigation is enabled

[moskvin]

Fixes an Internal Server Error (HTTP 500) on Nextcloud 34 when the FullTextSearch
navigation entry is enabled. The crash came from a static service-container lookup
(OCP\Server::get(...)/OC\Server::getL10NFactory()) performed while building the
navigation entry, which is unsafe during boot.

Root cause

lib/AppInfo/Application.php resolved the L10N factory and URL generator via the
static container inside fullTextSearchNavigation(). That closure runs only when the
app_navigation config flag is on, so the bug stays hidden on default installs but
500s as soon as navigation is enabled.

How to verify

1. Enable the app and navigation:
   occ app:enable fulltextsearch && occ config:app:set fulltextsearch app_navigation --value=1
2. Reload a page with the top nav - renders, no 500.

🤖 AI (if applicable)

• The content of this PR was partly or fully generated using AI

Related Links

• Replace getL10NFactory() in Application.php moskvin/fulltextsearch#1
• Fix admin UI without global jQuery #952

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