feat: add customer account page with profile information and actions

- Create Account.vue page component with user profile display
- Add account route to router.js
- Update Navbar.vue to remove avatar button (moved to Dock)
- Add avatar icon to Dock.vue for account page navigation
- Implement 'Contact us' action that opens manager chat via Telegram
- Implement 'Add to home screen' feature using Telegram Web App API 8.0+
- Add home screen status checking with checkHomeScreenStatus API
- Display customer registration date and days with us counter
- Add Russian language declension for days word (день/дня/дней)
- Update TelegramCustomerHandler to return created_at in saveOrUpdate response
- Add getByTelegramUserId method to TelecartCustomerService
- Store customer_created_at in Pulse store during app initialization
- Update App.vue to show Dock on account page
- Remove unused getCurrentCustomer API endpoint and function

frontend/spa/src/router.js

@@ -8,6 +8,7 @@ import Checkout from "@/views/Checkout.vue";
 import OrderCreated from "@/views/OrderCreated.vue";
 import Search from "@/views/Search.vue";
 import Filters from "@/views/Filters.vue";
+import Account from "@/views/Account.vue";
 import {useYaMetrikaStore} from "@/stores/yaMetrikaStore.js";
 
 const routes = [
@@ -29,6 +30,7 @@ const routes = [
     {path: '/checkout', name: 'checkout', component: Checkout},
     {path: '/success', name: 'order_created', component: OrderCreated},
     {path: '/search', name: 'search', component: Search},
+    {path: '/account', name: 'account', component: Account},
 ];
 
 export const router = createRouter({