Add SQLite database for Telegram bot user/group settings

- Replace Redis/in-memory storage with SQLite for persistence
- Add database.ts service with tables for users, groups, purchases, participants
- Update state.ts and groupState.ts to use SQLite backend
- Fix buyer_name to use display name instead of Telegram ID
- Remove legacy reminder array handlers (now using 3-slot system)
- Add better-sqlite3 dependency, remove ioredis
- Update env.example with BOT_DATABASE_PATH option
- Add data/ directory to .gitignore for database files

telegram_bot/src/handlers/help.ts

@@ -4,23 +4,32 @@ import { getMainMenuKeyboard } from '../utils/keyboards';
 import { messages } from '../messages';
 
 /**
- * Handle /help command
+ * Handle /lottohelp command
  */
 export async function handleHelpCommand(
   bot: TelegramBot,
-  msg: TelegramBot.Message
+  msg: TelegramBot.Message,
+  isGroup: boolean = false
 ): Promise<void> {
   const chatId = msg.chat.id;
   const userId = msg.from?.id;
 
   if (userId) {
-    logUserAction(userId, 'Viewed help');
+    logUserAction(userId, 'Viewed help', { isGroup });
   }
 
-  await bot.sendMessage(chatId, messages.help.message, {
-    parse_mode: 'Markdown',
-    reply_markup: getMainMenuKeyboard(),
-  });
+  if (isGroup) {
+    // Show group-specific help with admin commands
+    await bot.sendMessage(chatId, messages.help.groupMessage, {
+      parse_mode: 'Markdown',
+    });
+  } else {
+    // Show user help in DM
+    await bot.sendMessage(chatId, messages.help.message, {
+      parse_mode: 'Markdown',
+      reply_markup: getMainMenuKeyboard(),
+    });
+  }
 }
 
 export default handleHelpCommand;