Warenwirtschaft: OPT-1 Quick Wins + Entwicklungsplan V6.0

- N+1-Fix Ausschussliste: user.account eager laden (StockDisposalController@index)
- Composite-Indizes stock_entries(entry_type,status,ingredient_id/packaging_item_id) für InventoryService-Aggregationen
- Ungenutzten Eager-Load producedByUser aus ProductionRepository::listForIndex entfernt
- ExampleTest auf assertRedirect umgestellt (Suite 100% grün: 155 Tests)
- Query-Count-Regressionstest für die Ausschussliste
- Plan V6.0 (Code-Verifikation, OPT-Block, geklärte Kundenfragen)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/Feature/StockDisposalTest.php

@@ -1,11 +1,13 @@
 <?php
 
+use App\Models\Country;
 use App\Models\Ingredient;
 use App\Models\Location;
 use App\Models\PackagingItem;
 use App\Models\StockDisposal;
 use App\Models\StockEntry;
 use App\Models\Supplier;
+use App\Models\UserAccount;
 use App\Services\InventoryService;
 use App\User;
 use Illuminate\Foundation\Testing\RefreshDatabase;
@@ -207,6 +209,50 @@ test('liste und formular rendern', function () {
         ->assertSee('AP12-Render');
 });
 
+test('ausschuss-liste laedt benutzerkonten ohne n+1', function () {
+    $admin = ap12MakeUser(7);
+    $location = Location::factory()->create();
+    $ing = ap12MakeIngredient('AP12-N1');
+
+    $country = Country::query()->firstOrCreate(
+        ['code' => 'DE'],
+        ['phone' => '00', 'en' => 'Germany', 'de' => 'Deutschland', 'es' => 'Germany', 'fr' => 'Germany', 'it' => 'Germany', 'ru' => 'Germany', 'active' => true]
+    );
+
+    $makeDisposal = function () use ($ing, $location, $country) {
+        $account = UserAccount::query()->create(['first_name' => 'Vera', 'last_name' => 'Sucher', 'country_id' => $country->id]);
+        $user = ap12MakeUser(1);
+        $user->forceFill(['account_id' => $account->id])->save();
+
+        StockDisposal::query()->create([
+            'disposal_type' => 'ingredient', 'ingredient_id' => $ing->id, 'location_id' => $location->id,
+            'quantity' => 10, 'unit' => 'gram', 'reason' => 'Bruch / Beschädigung',
+            'disposed_at' => '2026-03-01', 'user_id' => $user->id,
+        ]);
+    };
+
+    $this->actingAs($admin, 'user');
+    $countQueries = function (): int {
+        DB::flushQueryLog();
+        DB::enableQueryLog();
+        $this->get(route('admin.inventory.stock-disposals.index'))->assertSuccessful();
+        $count = count(DB::getQueryLog());
+        DB::disableQueryLog();
+
+        return $count;
+    };
+
+    $makeDisposal();
+    $this->get(route('admin.inventory.stock-disposals.index'))->assertSuccessful(); // Warm-up
+    $baseline = $countQueries();
+
+    foreach (range(1, 5) as $i) {
+        $makeDisposal();
+    }
+
+    expect($countQueries())->toBeLessThanOrEqual($baseline);
+});
+
 test('chargen-endpoint liefert eingegangene chargen', function () {
     $user = ap12MakeUser(7);
     $location = Location::factory()->create();