feat: clear docs cache on deploy and register optimize command

[loadinglucian]

Wires up the docs:clear Artisan command end-to-end:

• Moves $this->optimizes(clear: 'docs:clear', key: 'docs') from boot() to register() in AppServiceProvider, which is the correct lifecycle phase for declaring service metadata; removes the now-empty boot() method
• Adds php artisan docs:clear step in the deploy script so the docs output cache is invalidated on every fresh deployment