fix: Add DNS retry logic to Telegram bot

Problem: Python urllib3 throwing 'Failed to resolve trading-bot-v4' errors
Root cause: Transient DNS resolution failures (similar to Node.js DNS issue)

Solution: Added retry_request() wrapper with exponential backoff:
- Retries DNS/connection errors up to 3 times
- 2s → 4s → 8s delays between attempts
- Same pattern as Node.js retryOperation() in drift/client.ts

Applied to:
- /status command (position fetching)
- Manual trade execution (most critical)

User request: Configure bot to handle DNS problems better
Result: Telegram bot now self-recovers from transient DNS failures

telegram_command_bot.py

@@ -4,10 +4,37 @@ Telegram Trade Bot - SECURE Command-based
 Only responds to YOUR commands in YOUR chat
 """
 import os
+import time
 import requests
 from telegram import Update
 from telegram.ext import Application, CommandHandler, ContextTypes, MessageHandler, filters
 
+def retry_request(func, max_retries=3, initial_delay=2):
+    """
+    Retry wrapper for DNS/connection failures
+    Similar to Node.js retryOperation() logic
+    """
+    for attempt in range(max_retries):
+        try:
+            return func()
+        except (requests.exceptions.ConnectionError, 
+                requests.exceptions.Timeout,
+                Exception) as e:
+            error_msg = str(e).lower()
+            # Check for transient DNS/connection errors
+            if 'name or service not known' in error_msg or \
+               'failed to resolve' in error_msg or \
+               'connection' in error_msg:
+                if attempt < max_retries - 1:
+                    delay = initial_delay * (2 ** attempt)
+                    print(f"⏳ DNS/connection error (attempt {attempt + 1}/{max_retries}): {e}", flush=True)
+                    print(f"   Retrying in {delay}s...", flush=True)
+                    time.sleep(delay)
+                    continue
+            # Non-transient error or max retries reached
+            raise
+    raise Exception(f"Max retries ({max_retries}) exceeded")
+
 # Configuration
 TELEGRAM_BOT_TOKEN = os.getenv('TELEGRAM_BOT_TOKEN')
 N8N_WEBHOOK_URL = os.getenv('N8N_WEBHOOK_URL')
@@ -58,12 +85,12 @@ async def status_command(update: Update, context: ContextTypes.DEFAULT_TYPE):
     print(f"📊 /status command received", flush=True)
     
     try:
-        # Fetch positions from trading bot API
-        response = requests.get(
+        # Fetch positions from trading bot API with retry logic
+        response = retry_request(lambda: requests.get(
             f"{TRADING_BOT_URL}/api/trading/positions",
             headers={'Authorization': f'Bearer {API_SECRET_KEY}'},
             timeout=10
-        )
+        ))
         
         print(f"📥 API Response: {response.status_code}", flush=True)
         
@@ -646,12 +673,12 @@ async def manual_trade_handler(update: Update, context: ContextTypes.DEFAULT_TYP
     try:
         print(f"🚀 Manual trade: {direction.upper()} {symbol_info['label']}{' (FORCED)' if force_trade else ''}", flush=True)
 
-        response = requests.post(
+        response = retry_request(lambda: requests.post(
             f"{TRADING_BOT_URL}/api/trading/execute",
             headers={'Authorization': f'Bearer {API_SECRET_KEY}'},
             json=payload,
             timeout=60,
-        )
+        ))
 
         print(f"📥 Manual trade response: {response.status_code}", flush=True)