Fix proxy env bug in Telegram alert

dashboard/backend/routers/auth.py

@@ -1,6 +1,5 @@
 from datetime import timedelta
 import asyncio
-import os
 import httpx
 from fastapi import APIRouter, Depends, HTTPException, status, Request
 from pydantic import BaseModel
@@ -36,11 +35,11 @@ async def send_failed_login_alert(ip_address: str, username: str, reason: str):
         return
     msg = f"🚨 *Dashboard Security Alert* 🚨\nFailed login attempt detected.\n\n👤 User: `{username}`\n🌐 IP: `{ip_address}`\n❌ Reason: {reason}"
     try:
+        client_options = {}
         if config.TELEGRAM_PROXY:
-            os.environ["HTTP_PROXY"] = config.TELEGRAM_PROXY
-            os.environ["HTTPS_PROXY"] = config.TELEGRAM_PROXY
+            client_options["proxy"] = config.TELEGRAM_PROXY
         
-        async with httpx.AsyncClient() as client:
+        async with httpx.AsyncClient(**client_options) as client:
             res = await client.post(
                 f"https://api.telegram.org/bot{config.TELEGRAM_BOT_TOKEN}/sendMessage",
                 data={"chat_id": config.TELEGRAM_CHAT_ID, "text": msg, "parse_mode": "Markdown"},