fix: pass Closure to SettingsMigrator::update() instead of raw values

[Copilot]

SettingsMigrator::update() requires a Closure as its second argument, but 2026_03_06_000000_update_social_media_settings.php was passing raw strings and null directly, causing a TypeError at runtime.

Changes

• database/settings/2026_03_06_000000_update_social_media_settings.php: Wrapped all values in arrow functions in both up() and down().

// Before
$this->migrator->update('site.github_url', 'https://www.github.com/liberusoftware');

// After
$this->migrator->update('site.github_url', fn () => 'https://www.github.com/liberusoftware');

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