feat: add subscription and transaction repositories

- Implemented SubscriptionRepository with methods to get, create, and update subscriptions.
- Added BalanceTXRepository for creating and retrieving balance transactions.
- Introduced a test script for simulating Pally webhook for local testing.

bot/keyboards/client.py

@@ -9,14 +9,17 @@ main_menu = InlineKeyboardBuilder(
     [
         [InlineKeyboardButton(text="📊 Подписка", callback_data="sub_info")],
         [
-            InlineKeyboardButton(text="⚙️ Купить", callback_data="buy"),
-            InlineKeyboardButton(text="⁉️ FAQ", callback_data="faq"),
+            InlineKeyboardButton(text="🛒 Купить", callback_data="buy"),
+            InlineKeyboardButton(text="💸 Пополнить", callback_data="deposit"),
         ],
         [
             InlineKeyboardButton(text="📢 Наш Канал", url="https://t.me/maleniavpn"),
             InlineKeyboardButton(text="🎧 Тех. Поддержка", url="https://t.me/maleniasupportbot"),
         ],
-        [InlineKeyboardButton(text="🔗 Обновить ссылку", callback_data="update_link")],
+        [
+            InlineKeyboardButton(text="🔗 Обновить ссылку", callback_data="update_link"),
+            InlineKeyboardButton(text="⁉️ FAQ", callback_data="faq"),
+        ],
         [InlineKeyboardButton(text="👤 Реферальная система", callback_data="referal")],
     ]
 ).as_markup()
@@ -46,6 +49,10 @@ support_url_kb: InlineKeyboardMarkup = InlineKeyboardBuilder(
     ]
 ).as_markup()
 
+deposit_kb: InlineKeyboardMarkup = InlineKeyboardBuilder(
+    [[InlineKeyboardButton(text="💸 Пополнить", callback_data="deposit")], [_return_to_menu_btn]]
+).as_markup()
+
 
 def _return_btn(data: str = "menu:main", text: str = "⬅️ Назад") -> InlineKeyboardButton:
     return InlineKeyboardButton(text=text, callback_data=data)