Add subscription link field to user model

- Add subscription_link column to users table (nullable, unique)
- Add SUBSCRIPTION_URL to config settings
- Update user creation to include subscription link from Remnawave
- Add support subscription ticket creation with formatted message
- Add "update link" button to main menu
- Refactor support subscription formatting to include user details

keyboards/client.py

@@ -15,6 +15,7 @@ main_menu: InlineKeyboardMarkup = InlineKeyboardBuilder(
             InlineKeyboardButton(text="Наш Канал", url="https://goo.gle"),
             InlineKeyboardButton(text="Тех. Поддержка", callback_data="support"),
         ],
+        [InlineKeyboardButton(text="🔗 Обновить ссылку", callback_data="update_link")],
     ]
 ).as_markup()
 
@@ -90,7 +91,7 @@ def duration_selector(
 
 payment_gateways: InlineKeyboardMarkup = InlineKeyboardBuilder(
     [
-        [InlineKeyboardButton(text="✍️ Поддержка", callback_data="support")],
+        [InlineKeyboardButton(text="✍️ Перейти в поддержку", callback_data="checkout")],
         [_return_to_menu_btn],
     ]
 ).as_markup()