Optimierung 3.1: Company::scopeAccessibleBy() zentralisiert Firmenzugriff

Die 4x identische Zugriffs-Closure (owner_user_id == me OR whereHas('users',
me)) in CompanyController (index/show), PressReleaseController::
findOwnedCompany und CustomerCompanyContext::accessibleCompanyQuery durch
einen Company::scopeAccessibleBy() ersetzt; das Scope-Verhalten
(withoutGlobalScopes) bleibt beim Aufrufer.

Bewusst unangetastet: User::accessibleCompanyIds() (relationenbasiert MIT
globalen Scopes - anderes Scope-Verhalten) und PressReleaseImageController
(prueft PR-Autorschaft user_id, nicht Firmenzugriff).

Tests: neuer Scope-Test; volle Suite gruen (801 passed, 1 skipped).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/Http/Controllers/Api/V1/CompanyController.php

@@ -15,10 +15,7 @@ class CompanyController extends Controller
         abort_unless($request->user()->tokenCan('companies:read'), 403);
 
         $companies = Company::withoutGlobalScopes()
-            ->where(function ($query) use ($request): void {
-                $query->where('owner_user_id', $request->user()->id)
-                    ->orWhereHas('users', fn ($users) => $users->whereKey($request->user()->id));
-            })
+            ->accessibleBy($request->user())
             ->orderBy('name')
             ->paginate(min((int) $request->query('per_page', 25), 100));
 
@@ -36,10 +33,7 @@ class CompanyController extends Controller
 
         $company = Company::withoutGlobalScopes()
             ->whereKey($company)
-            ->where(function ($query) use ($request): void {
-                $query->where('owner_user_id', $request->user()->id)
-                    ->orWhereHas('users', fn ($users) => $users->whereKey($request->user()->id));
-            })
+            ->accessibleBy($request->user())
             ->first();
 
         abort_unless($company !== null, 403);

app/Http/Controllers/Api/V1/PressReleaseController.php

@@ -183,10 +183,7 @@ class PressReleaseController extends Controller
     {
         return Company::withoutGlobalScopes()
             ->whereKey($companyId)
-            ->where(function ($query) use ($request): void {
-                $query->where('owner_user_id', $request->user()->id)
-                    ->orWhereHas('users', fn ($users) => $users->whereKey($request->user()->id));
-            })
+            ->accessibleBy($request->user())
             ->first();
     }