Faza 7: White-label per tenant — logo + theme color dinamic

- spatie/laravel-medialibrary instalat (migration media table)
- filament/spatie-laravel-media-library-plugin
- Company implements HasMedia + InteractsWithMedia
  - collections: 'logo' + 'favicon' (singleFile)
  - getLogoUrl() / getFaviconUrl() helpers
- Settings page extins: secțiune Logo & favicon cu FileUpload
  - On save: clear collection + addMedia from temp upload + cleanup tmp file
- TenantPanelProvider render hooks:
  - HEAD_END: theme-color meta + favicon + CSS vars override
    (--primary-50 → --primary-950 generate din hex theme_color)
  - SIDEBAR_LOGO_BEFORE: afișare logo upload-uit, max-height 56px

Cum funcționează:
- Tenant uploadează logo în Settings
- La fiecare request, render hook injectează <style> cu CSS vars custom
- Filament respectă --primary-* → toate butoanele/badge-urile primesc culoarea brand
- Logo apare deasupra meniului (sidebar)

app/Models/Central/Company.php

@@ -4,10 +4,10 @@ namespace App\Models\Central;
 
 use App\Models\Tenant\User;
 use Illuminate\Database\Eloquent\SoftDeletes;
+use Spatie\MediaLibrary\HasMedia;
+use Spatie\MediaLibrary\InteractsWithMedia;
+use Spatie\MediaLibrary\MediaCollections\Models\Media;
 use Stancl\Tenancy\Database\Models\Tenant as BaseTenant;
-use Stancl\Tenancy\Contracts\TenantWithDatabase;
-use Stancl\Tenancy\Database\Concerns\HasDatabase;
-use Stancl\Tenancy\Database\Concerns\HasDomains;
 
 /**
  * Tenant model — extends Stancl Tenant for compatibility with the package
@@ -16,9 +16,9 @@ use Stancl\Tenancy\Database\Concerns\HasDomains;
  * In single-DB mode we don't use HasDatabase. Domain identification is
  * handled by our own ResolveTenant middleware (slug-based, not DNS records).
  */
-class Company extends BaseTenant
+class Company extends BaseTenant implements HasMedia
 {
-    use SoftDeletes;
+    use InteractsWithMedia, SoftDeletes;
 
     protected $table = 'companies';
 
@@ -78,4 +78,22 @@ class Company extends BaseTenant
         $central = config('app.central_domain') ?: 'service.mir.md';
         return "https://{$this->slug}.{$central}{$path}";
     }
+
+    public function registerMediaCollections(): void
+    {
+        $this->addMediaCollection('logo')->singleFile();
+        $this->addMediaCollection('favicon')->singleFile();
+    }
+
+    public function getLogoUrl(): ?string
+    {
+        $m = $this->getFirstMedia('logo');
+        return $m ? $m->getUrl() : null;
+    }
+
+    public function getFaviconUrl(): ?string
+    {
+        $m = $this->getFirstMedia('favicon');
+        return $m ? $m->getUrl() : null;
+    }
 }