Replace mock Django secret key with longer version to resolve security
warnings in development stack.
Still not production-suitable as key remains versioned in repository,
but eliminates security warnings during development workflow.
Enable LiveKit webhook feature to notify backend when events occur in rooms.
Configure LiveKit to call our endpoint whenever events are triggered,
providing real-time updates on room activities. Refer to LiveKit
documentation or LiveKitWebhookEventType enum for complete list of available
events.
This commit is not functionnal, LiveKit fails verifying our backend's
certificate. It will be fixed in the upcoming commits.
