Add request debug logging to /api/updates endpoint

- Log request method, User-Agent header, and all headers on request arrival
- Helps debug what user agent the client is actually sending

app/api/routes.py

@@ -568,6 +568,11 @@ def api_get_updates():
         from app.models import Match, User
         from flask_jwt_extended import jwt_required, get_jwt_identity, verify_jwt_in_request
         from app.auth.jwt_utils import validate_api_token, extract_token_from_request
+        from flask import request
+
+        # Debug logging for request
+        user_agent = request.headers.get('User-Agent')
+        logger.info(f"api_get_updates: Request received - Method: {request.method}, User-Agent: '{user_agent}', Headers: {dict(request.headers)}")
 
         user = None
         auth_method = None