feat: add product interaction mode selector with three scenarios

- Add ItemToggleButton component for 3-way toggle in admin panel
- Add product_interaction_mode setting with options: order, manager, browser
- Add manager_username setting for Telegram manager contact
- Remove store_enabled setting, replaced with product_interaction_mode
- Create migration to automatically migrate store_enabled to product_interaction_mode
- Update Product.vue to handle all three interaction modes
- Update Dock.vue to show cart button only when product_interaction_mode is 'order'
- Rename 'Магазин' tab to 'Витрина' in admin panel
- Remove 'Разрешить покупки' option (now controlled via product_interaction_mode)
- Set default product_interaction_mode to 'browser'
- Update StoreDTO to remove enableStore field
- Update SettingsHandler to return product_interaction_mode instead of store_enabled

frontend/spa/src/components/Dock.vue

@@ -45,7 +45,7 @@
     </RouterLink>
 
     <RouterLink
-        v-if="settings.store_enabled"
+        v-if="settings.product_interaction_mode === 'order'"
         :to="{name: 'cart'}"
         :class="{'dock-active': route.name === 'cart'}"
         @click="onDockItemClick"

frontend/spa/src/stores/SettingsStore.js

@@ -5,7 +5,8 @@ export const useSettingsStore = defineStore('settings', {
     state: () => ({
         app_enabled: true,
         app_debug: false,
-        store_enabled: true,
+        product_interaction_mode: 'browser',
+        manager_username: null,
         app_name: 'OpenCart Telegram магазин',
         app_icon: '',
         night_auto: true,
@@ -41,7 +42,8 @@ export const useSettingsStore = defineStore('settings', {
             this.ya_metrika_enabled = settings.ya_metrika_enabled;
             this.app_enabled = settings.app_enabled;
             this.app_debug = settings.app_debug;
-            this.store_enabled = settings.store_enabled;
+            this.product_interaction_mode = settings.product_interaction_mode ?? 'browser';
+            this.manager_username = settings.manager_username;
             this.feature_coupons = settings.feature_coupons;
             this.feature_vouchers = settings.feature_vouchers;
             this.show_category_products_button = settings.show_category_products_button ?? true;

frontend/spa/src/views/Product.vue

@@ -123,7 +123,8 @@
     <div v-if="product.product_id"
          class="fixed bottom-fix px-4 pb-4 pt-4 left-0 w-full bg-base-100/95 backdrop-blur-md z-50 flex flex-col gap-3 border-t border-base-300 shadow-lg"
     >
-      <template v-if="settings.store_enabled">
+      <!-- Режим: Создание заказа -->
+      <template v-if="settings.product_interaction_mode === 'order'">
         <div v-if="error" class="alert alert-error alert-sm py-2">
           <svg xmlns="http://www.w3.org/2000/svg" class="stroke-current shrink-0 h-4 w-4" fill="none"
                viewBox="0 0 24 24">
@@ -175,7 +176,27 @@
         </div>
       </template>
 
-      <template v-else>
+      <!-- Режим: Кнопка связи с менеджером -->
+      <template v-else-if="settings.product_interaction_mode === 'manager'">
+        <button
+            class="btn btn-primary btn-lg w-full shadow-md"
+            :disabled="!settings.manager_username"
+            @click="openManagerChat"
+        >
+          <template v-if="settings.manager_username">
+            <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5"
+                 stroke="currentColor" class="w-5 h-5">
+              <path stroke-linecap="round" stroke-linejoin="round"
+                    d="M20.25 8.511c.884.284 1.5 1.128 1.5 2.097v4.286c0 1.136-.847 2.1-1.98 2.193-.34.027-.68.052-1.02.072v3.091l-3-3c-1.354 0-2.694-.055-4.02-.163a2.115 2.115 0 0 1-.825-.242m9.345-8.334a2.126 2.126 0 0 0-.476-.095 48.64 48.64 0 0 0-8.048 0c-1.131.094-1.976 1.057-1.976 2.192v4.286c0 .837.46 1.58 1.155 1.951m9.345-8.334V6.637c0-1.621-1.152-3.026-2.76-3.235A48.455 48.455 0 0 0 11.25 3c-2.115 0-4.198.137-5.74.402-1.608.209-2.76 1.614-2.76 3.235v6.226c0 1.621 1.152 3.026 2.76 3.235.577.075 1.157.14 1.74.194V21l4.155-4.155"/>
+            </svg>
+            Связаться с менеджером
+          </template>
+          <template v-else>Менеджер недоступен</template>
+        </button>
+      </template>
+
+      <!-- Режим: Открытие товара на сайте -->
+      <template v-else-if="settings.product_interaction_mode === 'browser'">
         <button
             class="btn btn-primary btn-lg w-full shadow-md"
             :disabled="! product.share"
@@ -301,6 +322,27 @@ function openProductInMarketplace() {
   window.Telegram.WebApp.openLink(product.value.share, {try_instant_view: false});
 }
 
+function openManagerChat() {
+  if (!settings.manager_username) {
+    return;
+  }
+
+  window.Telegram.WebApp.HapticFeedback.selectionChanged();
+  
+  // Формируем ссылку для открытия чата с менеджером
+  // manager_username должен быть username (например, @username)
+  const managerUsername = String(settings.manager_username).trim();
+  
+  // Если username начинается с @, убираем @
+  const username = managerUsername.startsWith('@') 
+    ? managerUsername.substring(1) 
+    : managerUsername;
+  
+  const chatUrl = `https://t.me/${username}`;
+  
+  window.Telegram.WebApp.openTelegramLink(chatUrl);
+}
+
 function setQuantity(newQuantity) {
   quantity.value = newQuantity;
   window.Telegram.WebApp.HapticFeedback.selectionChanged();