[Enhancement] If using client mode, do not send peers from another ws-domain

[schlagmichdoch]

Describe the bug
Currently, peer secrets are saved in one database without specifying the websocket domain they are used with. This is not a problem for normal operation, as the IndexedDB databases are specific to each domain.

Expected behavior
To prevent sending secrets not created by the websockets specified via the client mode, we should add an entry ws-domain to the table and save the currently used websocket domain to it. Then, when connecting to a websocket, only those peer secrets belonging to the ws-domain or rather always only get those room secrets that belong to the websocket domain via the PersistentStorage class.