Auto-generate company slug server-side in CompanyRequest

CompanyRequest::getCompanyPayload() accepted 'slug' from the client but never generated it, so the installation wizard (which PUTs /api/v1/company) left the slug empty when setting up the first company. Match the sibling CompaniesRequest (which already does Str::slug($this->name)) and generate the slug from the name server-side; drop the now-unused 'slug' validation rule.

Fixes the same bug that master's ed7af3fc tried to fix client-side with a lodash deburr + regex workaround in Step7CompanyInfo.vue. v3.0's installation wizard is a rewrite under resources/scripts/features/installation/CompanyView.vue and doesn't carry that workaround, so the cleaner fix is to make the backend authoritative like CompaniesRequest already is.

app/Http/Requests/CompanyRequest.php

@@ -3,6 +3,7 @@
 namespace App\Http\Requests;
 
 use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Support\Str;
 use Illuminate\Validation\Rule;
 
 class CompanyRequest extends FormRequest
@@ -31,9 +32,6 @@ class CompanyRequest extends FormRequest
             'tax_id' => [
                 'nullable',
             ],
-            'slug' => [
-                'nullable',
-            ],
             'address.country_id' => [
                 'required',
             ],
@@ -45,10 +43,12 @@ class CompanyRequest extends FormRequest
         return collect($this->validated())
             ->only([
                 'name',
-                'slug',
                 'vat_id',
                 'tax_id',
             ])
+            ->merge([
+                'slug' => Str::slug($this->name),
+            ])
             ->toArray();
     }
 }