feat: implement Telegram API integration using fetch

- Replace mock implementation with actual Telegram Bot API calls
- Use Node.js fetch to send messages via https://api.telegram.org/bot
- Add proper error handling for API responses
- Include detailed error messages in response
- Fix linter issues with property shorthand

Author: SeddikBellamine

dapp/src/telegramService.js

@@ -11,15 +11,46 @@ async function sendTelegram({
   if (!message || message.trim() === '')
     throw new Error('Message content is required');
 
-
   const messageToSend = `Message from: ${senderName}\n${message}`;
 
-  console.log('removed lib for testing');
+  try {
+    const response = await fetch(`https://api.telegram.org/bot${botToken}/sendMessage`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify({
+        chat_id: chatId,
+        text: messageToSend,
+        parse_mode: 'HTML'
+      })
+    });
+
+    const result = await response.json();
+
+    if (!response.ok) {
+      console.error('Telegram API Error:', result);
+      return {
+        message: 'Failed to send Telegram message.',
+        status: response.status,
+        error: result.description
+      };
+    }
 
-  return {
-    message: 'Your telegram message has been sent successfully.',
-    status: 200,
-  };
+    console.log('Message successfully sent by Telegram bot.');
+    return {
+      message: 'Your telegram message has been sent successfully.',
+      status: 200,
+      result
+    };
+  } catch (error) {
+    console.error('Failed to send Telegram message:', error);
+    return {
+      message: 'Failed to send Telegram message.',
+      status: 500,
+      error: error.message
+    };
+  }
 }
 
 export default sendTelegram;