Create 2 modules and set the view access level for the module accordingly. If you want the uploads to be unique to the module then set the asset for the gallery module to module.[module_id].

1. We have set the asset of one module to module.[180]... But when we create an album, it is not shown in the module ?????

Don't replace module_id with the actual module id as it's meant to be a substitution, but I forgot that's not implemented into CB Gallery yet and only in CB Activity at the moment. Instead set the asset to module.MODULE_ID, but this time do replace the id so you'd have "module.180" for 1 module and for your other for example "module.181". This would make the uploads to each be specific to the module.

2. Even if the viewing access is set to admins, the public users can see the private photos. That is not good...

I don't understand what you mean by private photos. There are no private photos. CB Gallery has no access permissions on a per photo basis. You can only control who can and can not see the gallery as a whole at this time. In this case it's just setting the access on the module it self.

4. Do you plan some SEO for cb gallery??? domain.tld/cbgallery?action=folder&func=show&id=13&gallery=6d67d511827cd6ee327f6cdbb8d4c0ff&return=aHR0cHM6Ly9odW5kZWZyZXVuZGUubnJ3L2JpbGRlci11bmQtdmlkZW9zL2JpbGRlcmdhbGVyaWU= is not very search engine friendly ....

Yes, all plugins with component endpoints like CB Gallery and a few others will have rewrite rules added. GJ is the first to really utilize this and is a test of this new API.

5. Is there a way to show which photo was uploaded by which user?

Who uploaded it is in the modal window. If you mean in the container box then no not unless you modify the template files and add it your self.