Address round-5 reviewer feedback on PR #747:
- Escape `webhook_uri` in the admin pane HTML template so an operator-
controlled env value (`WEBHOOK_INTERNAL_URL`, `NEXTCLOUD_MCP_SERVER_URL`)
can't inject markup. The sibling `preset_id` and exception messages were
already escaped — this one was the odd one out.
- Convert the eight remaining f-string `logger.warning`/`logger.error`
calls in `api/webhooks.py` to lazy `%s` formatting, matching the style
already adopted by `webhook_receiver.py` and `webhook_routes.py`.
- Document why the 401 from `handle_nextcloud_webhook` deliberately omits
`WWW-Authenticate`: NC's webhook delivery worker has no auth-flow state
machine to negotiate against, the bearer is a static shared secret
configured out-of-band via `WEBHOOK_SECRET`, and a challenge response
wouldn't change client behaviour. The existing warning log already
records the rejection.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
