feat: custom media resource with alt tags form

[Baspa]

Media Resource Alt Tags

Todo

• Test
• Check code and remove symlinks
• Merge feat: media optimizations media#9
• Update install script with correct config values:

media.php:

Replace

        'resource' => MediaResource::class,

with

        'resource' => \Backstage\Resources\MediaResource::class,

translations.php:

Replace

                'model' => 'gpt-4.1',

with

                'model' => 'gpt-5',

[Baspa]

@Casmo this PR should be moved to the CMS repo, right?