Allow to group the list of the services by the assigned project/namespace

[bohdan-shulha]

The first customer has ~16 services overall and it is extremely hard to find the needed resources.

Services should get the following internal domain format:

<process>.<service>.<project>.<namespace>.local

Users will not be able to edit internal domains anymore to simplify the configuration and internals of the SaaS itself.

Example domain:

svc.mysql-wp.e-sportstats.prod.local

The default - system (.ptah.local?) - namespace should be created for all teams.

Caddy should be instantiated under this namespace.

[bohdan-shulha]

Move out of MVP scope as this feature is going to be tied to 1-Click apps.

[bohdan-shulha]

Moved far away, we'll start with concept of "Service Templates".

[bohdan-shulha]

Will be partially covered by #102