feat: APIUrl include protocol

feat: config DDNSDomain and SOAEmail

chore: update mod name and dependencies

chore: implement changes from linters, update copyright years

feat: temporary docs on the manage page

feat: some logging improvements

docs: fix doc about dots in domain pattern

refactor: backend -> api, move routers

refactor: directory layout

feat: add note about domain pattern

feat: sessions, login, default admin user

feat: config options for service name and dns pattern

feat: initial commit