feat: Add Telegram bot with group support

- Full Telegram bot implementation for Lightning Jackpot
- Commands: /start, /buy, /tickets, /wins, /address, /jackpot, /help
- Lightning invoice generation with QR codes
- Payment polling and confirmation notifications
- User state management (Redis/in-memory fallback)
- Group support with admin settings panel
- Configurable draw announcements and reminders
- Centralized messages for easy i18n
- Docker configuration included

telegram_bot/src/handlers/help.ts

@@ -0,0 +1,26 @@
+import TelegramBot from 'node-telegram-bot-api';
+import { logUserAction } from '../services/logger';
+import { getMainMenuKeyboard } from '../utils/keyboards';
+import { messages } from '../messages';
+
+/**
+ * Handle /help command
+ */
+export async function handleHelpCommand(
+  bot: TelegramBot,
+  msg: TelegramBot.Message
+): Promise<void> {
+  const chatId = msg.chat.id;
+  const userId = msg.from?.id;
+
+  if (userId) {
+    logUserAction(userId, 'Viewed help');
+  }
+
+  await bot.sendMessage(chatId, messages.help.message, {
+    parse_mode: 'Markdown',
+    reply_markup: getMainMenuKeyboard(),
+  });
+}
+
+export default handleHelpCommand;