bug(tests): simple_terminal.e2e_test.py WebSocket URL missing https→wss protocol upgrade

[mrveiss]

Problem

In autobot-backend/api/simple_terminal.e2e_test.py, the WebSocket URL is constructed by replacing http:// with ws://:

ws_url = base_url.replace('http://', 'ws://')

This does not handle https:// → wss://. When AUTOBOT_TEST_BACKEND_URL is set to an HTTPS endpoint (e.g. staging/prod), the URL silently stays as https://... and the WebSocket connection fails.

Fix

ws_url = base_url.replace('https://', 'wss://').replace('http://', 'ws://')

Why

Discovered during code review of PR #3727 (scored 75 — real but infrequent in practice).

[mrveiss]

✅ Merged in PR #3758