feat(pos): Display showcase kits in POS interface

- Added get_showcase_kits_for_pos() function to retrieve showcase kits with active reservations
- Modified POS terminal to show showcase kits when 'Витрина' button is clicked
- Showcase kits displayed as product cards with showcase name badge (🌺 icon)
- Added isShowcaseView flag to toggle between regular and showcase view modes
- Implemented distinct styling for active showcase button:
  * Bright orange background (#ff6600)
  * Black text for contrast
  * Thicker border (3px)
  * Enhanced shadow and scale effect (1.05)
- Showcase kits can be added to cart for sale from POS interface

myproject/pos/static/pos/js/terminal.js

@@ -2,8 +2,10 @@
 
 const CATEGORIES = JSON.parse(document.getElementById('categoriesData').textContent);
 const ITEMS = JSON.parse(document.getElementById('itemsData').textContent);  // Единый массив товаров и комплектов
+const SHOWCASE_KITS = JSON.parse(document.getElementById('showcaseKitsData').textContent);  // Витринные комплекты
 
 let currentCategoryId = null;
+let isShowcaseView = false;  // Флаг режима просмотра витринных букетов
 const cart = new Map(); // "type-id" -> {id, name, price, qty, type}
 
 function formatMoney(v) {
@@ -18,33 +20,14 @@ function renderCategories() {
   const showcaseCol = document.createElement('div');
   showcaseCol.className = 'col-6 col-sm-4 col-md-3 col-lg-2';
   const showcaseCard = document.createElement('div');
-  showcaseCard.className = 'card category-card showcase-card';
+  showcaseCard.className = 'card category-card showcase-card' + (isShowcaseView ? ' active' : '');
   showcaseCard.style.backgroundColor = '#fff3cd';
   showcaseCard.style.borderColor = '#ffc107';
-  showcaseCard.onclick = async () => {
-    try {
-      const response = await fetch('/pos/api/showcase-items/');
-      const data = await response.json();
-      
-      if (data.success && data.showcases.length > 0) {
-        let message = '🌺 ВИТРИННЫЕ БУКЕТЫ\n\n';
-        
-        data.showcases.forEach(showcase => {
-          message += `● ${showcase.name} (Склад: ${showcase.warehouse})\n`;
-          showcase.items.forEach(item => {
-            message += `   - ${item.product_name}: ${item.quantity} шт\n`;
-          });
-          message += '\n';
-        });
-        
-        alert(message);
-      } else {
-        alert('Витрины пусты');
-      }
-    } catch (error) {
-      console.error('Error fetching showcase items:', error);
-      alert('Ошибка загрузки витринных букетов');
-    }
+  showcaseCard.onclick = () => {
+    isShowcaseView = true;
+    currentCategoryId = null;
+    renderCategories();
+    renderProducts();
   };
   const showcaseBody = document.createElement('div');
   showcaseBody.className = 'card-body';
@@ -60,9 +43,10 @@ function renderCategories() {
   const allCol = document.createElement('div');
   allCol.className = 'col-6 col-sm-4 col-md-3 col-lg-2';
   const allCard = document.createElement('div');
-  allCard.className = 'card category-card' + (currentCategoryId === null ? ' active' : '');
+  allCard.className = 'card category-card' + (currentCategoryId === null && !isShowcaseView ? ' active' : '');
   allCard.onclick = () => {
     currentCategoryId = null;
+    isShowcaseView = false;
     renderCategories();
     renderProducts();
   };
@@ -82,9 +66,10 @@ function renderCategories() {
     col.className = 'col-6 col-sm-4 col-md-3 col-lg-2';
     
     const card = document.createElement('div');
-    card.className = 'card category-card' + (currentCategoryId === cat.id ? ' active' : '');
+    card.className = 'card category-card' + (currentCategoryId === cat.id && !isShowcaseView ? ' active' : '');
     card.onclick = () => {
       currentCategoryId = cat.id;
+      isShowcaseView = false;
       renderCategories();
       renderProducts();
     };
@@ -108,9 +93,17 @@ function renderProducts() {
   grid.innerHTML = '';
   const searchTerm = document.getElementById('searchInput').value.toLowerCase();
   
-  let filtered = currentCategoryId
-    ? ITEMS.filter(item => (item.category_ids || []).includes(currentCategoryId))
-    : ITEMS;
+  let filtered;
+  
+  // Если выбран режим витрины - показываем витринные комплекты
+  if (isShowcaseView) {
+    filtered = SHOWCASE_KITS;
+  } else {
+    // Обычный режим - показываем товары и комплекты
+    filtered = currentCategoryId
+      ? ITEMS.filter(item => (item.category_ids || []).includes(currentCategoryId))
+      : ITEMS;
+  }
   
   if (searchTerm) {
     filtered = filtered.filter(item => item.name.toLowerCase().includes(searchTerm));
@@ -149,9 +142,17 @@ function renderProducts() {
     
     const stock = document.createElement('div');
     stock.className = 'product-stock';
-    stock.textContent = item.in_stock ? 'В наличии' : 'Под заказ';
-    if (!item.in_stock) {
-      stock.style.color = '#dc3545';
+    
+    // Для витринных комплектов показываем название витрины
+    if (item.type === 'showcase_kit') {
+      stock.textContent = `🌺 ${item.showcase_name}`;
+      stock.style.color = '#856404';
+      stock.style.fontWeight = 'bold';
+    } else {
+      stock.textContent = item.in_stock ? 'В наличии' : 'Под заказ';
+      if (!item.in_stock) {
+        stock.style.color = '#dc3545';
+      }
     }
     
     const sku = document.createElement('div');