fix(course): use absolute avatar url in live session token

Return an absolute URI for the avatar in live session token
metadata so external services (e.g., PlugNMeet) can fetch the
image reliably. Add debug logging to PlugNMeet client POST
requests and info logging for the resolved profile picture URL
to aid troubleshooting.

apps/course/services/plugnmeet.py

@@ -47,6 +47,10 @@ class PlugNMeetClient:
             "API-KEY": self.api_key,
             "HASH-SIGNATURE": self._build_signature(body),
         }
+        
+        import logging
+        logger = logging.getLogger(__name__)
+        logger.debug(f"[PlugNMeet] POST {path} - Body: {body[:500]}")
 
         try:
             response = requests.post(url, data=body.encode("utf-8"), headers=headers, timeout=self.timeout)

apps/course/views/live_session.py

@@ -219,6 +219,7 @@ class CourseLiveSessionTokenAPIView(GenericAPIView):
 
         user_metadata = {}
         profile_pic = self._build_profile_url(request, user)
+        logger.info(f"[LiveSession Token] Profile pic URL - user_id={user.id} url={profile_pic}")
         if profile_pic:
             user_metadata['profilePic'] = profile_pic
 
@@ -272,5 +273,5 @@ class CourseLiveSessionTokenAPIView(GenericAPIView):
     def _build_profile_url(request, user):
         avatar = getattr(user, 'avatar', None)
         if avatar and getattr(avatar, 'url', None):
-            return avatar.url
+            return request.build_absolute_uri(avatar.url)
         return None