🛂(backend) disallow unregistered rooms

Require users to create a room in the database
before requesting a LiveKit token.

If user request an access token for a room that doesn't
exist in our db, its request would end in a 404 error.

Ensure that rooms must be registered by a user before they can be accessed.
By default, all created rooms remain public, allowing anonymous users to join
any room created by a logged-in user.

However, anonymous users cannot create rooms themselves.

env.d/development/common.dist

@@ -41,3 +41,4 @@ OIDC_AUTH_REQUEST_EXTRA_PARAMS={"acr_values": "eidas1"}
 LIVEKIT_API_SECRET=secret
 LIVEKIT_API_KEY=devkey
 LIVEKIT_API_URL=http://localhost:7880
+ALLOW_UNREGISTERED_ROOMS=False