ver. 0.302: REST API product variants, attributes dictionary, attribute filtering

- Add variant CRUD endpoints (variants, create_variant, update_variant, delete_variant)
- Add dictionaries/attributes endpoint with multilingual names and values
- Add attribute_* filter params for product list filtering by attribute values
- Enrich product detail attributes with translated names (attribute_names, value_names)
- Include variants array in product detail response for parent products
- Add price_brutto validation on product create
- Batch-load attribute/value translations (4 queries instead of N+1)
- Add 43 new unit tests (730 total, 2066 assertions)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

autoload/Domain/Attribute/AttributeRepository.php

@@ -534,6 +534,127 @@ class AttributeRepository
         return $attributes;
     }
 
+    /**
+     * Zwraca aktywne atrybuty z wartościami i wielojęzycznymi nazwami dla REST API.
+     *
+     * @return array<int, array<string, mixed>>
+     */
+    public function listForApi(): array
+    {
+        // 1. Get all active attribute IDs (1 query)
+        $rows = $this->db->select('pp_shop_attributes', ['id', 'type', 'status'], [
+            'status' => 1,
+            'ORDER' => ['o' => 'ASC'],
+        ]);
+        if (!is_array($rows) || empty($rows)) {
+            return [];
+        }
+
+        $attrIds = [];
+        foreach ($rows as $row) {
+            $id = (int)($row['id'] ?? 0);
+            if ($id > 0) {
+                $attrIds[] = $id;
+            }
+        }
+        if (empty($attrIds)) {
+            return [];
+        }
+
+        // 2. Batch load ALL attribute translations (1 query)
+        $allAttrTranslations = $this->db->select(
+            'pp_shop_attributes_langs',
+            ['attribute_id', 'lang_id', 'name'],
+            ['attribute_id' => $attrIds]
+        );
+        $attrNamesMap = [];
+        if (is_array($allAttrTranslations)) {
+            foreach ($allAttrTranslations as $t) {
+                $aId = (int)($t['attribute_id'] ?? 0);
+                $langId = (string)($t['lang_id'] ?? '');
+                if ($aId > 0 && $langId !== '') {
+                    $attrNamesMap[$aId][$langId] = (string)($t['name'] ?? '');
+                }
+            }
+        }
+
+        // 3. Batch load ALL values for those attribute IDs (1 query)
+        $allValueRows = $this->db->select(
+            'pp_shop_attributes_values',
+            ['id', 'attribute_id', 'is_default', 'impact_on_the_price'],
+            [
+                'attribute_id' => $attrIds,
+                'ORDER' => ['id' => 'ASC'],
+            ]
+        );
+        $valuesByAttr = [];
+        $allValueIds = [];
+        if (is_array($allValueRows)) {
+            foreach ($allValueRows as $vRow) {
+                $valueId = (int)($vRow['id'] ?? 0);
+                $attrId = (int)($vRow['attribute_id'] ?? 0);
+                if ($valueId > 0 && $attrId > 0) {
+                    $valuesByAttr[$attrId][] = $vRow;
+                    $allValueIds[] = $valueId;
+                }
+            }
+        }
+
+        // 4. Batch load ALL value translations (1 query)
+        $valueNamesMap = [];
+        if (!empty($allValueIds)) {
+            $allValueTranslations = $this->db->select(
+                'pp_shop_attributes_values_langs',
+                ['value_id', 'lang_id', 'name'],
+                ['value_id' => $allValueIds]
+            );
+            if (is_array($allValueTranslations)) {
+                foreach ($allValueTranslations as $vt) {
+                    $vId = (int)($vt['value_id'] ?? 0);
+                    $langId = (string)($vt['lang_id'] ?? '');
+                    if ($vId > 0 && $langId !== '') {
+                        $valueNamesMap[$vId][$langId] = (string)($vt['name'] ?? '');
+                    }
+                }
+            }
+        }
+
+        // 5. Assemble result in-memory
+        $result = [];
+        foreach ($rows as $row) {
+            $attributeId = (int)($row['id'] ?? 0);
+            if ($attributeId <= 0) {
+                continue;
+            }
+
+            $names = isset($attrNamesMap[$attributeId]) ? $attrNamesMap[$attributeId] : [];
+
+            $values = [];
+            if (isset($valuesByAttr[$attributeId])) {
+                foreach ($valuesByAttr[$attributeId] as $vRow) {
+                    $valueId = (int)$vRow['id'];
+                    $impact = $vRow['impact_on_the_price'];
+                    $values[] = [
+                        'id' => $valueId,
+                        'names' => isset($valueNamesMap[$valueId]) ? $valueNamesMap[$valueId] : [],
+                        'is_default' => (int)($vRow['is_default'] ?? 0),
+                        'impact_on_the_price' => ($impact !== null && $impact !== '') ? (float)$impact : null,
+                    ];
+                }
+            }
+
+            $result[] = [
+                'id' => $attributeId,
+                'type' => (int)($row['type'] ?? 0),
+                'status' => (int)($row['status'] ?? 0),
+                'names' => $names,
+                'values' => $values,
+            ];
+        }
+
+        return $result;
+    }
+
     /**
      * @return array{sql: string, params: array<string, mixed>}
      */