feat(server): add registry commands to manage Docker logins

[andrasbacsai]

Summary

• Adds a new coolify server registry command group (alias registries) for managing Docker registry logins on servers:
  • list <server_uuid> shows the registries the server is logged in to, their status (Logged in / Credential helper / Not logged in), and a summary of which resources use them, such as "3 applications, 1 database". Usernames are hidden in table output unless -s is passed. JSON output includes the full used_by details. If the API returns an error field, it is printed as a warning. This command needs a token with read:sensitive.
  • login <server_uuid> [<server_uuid>...] runs docker login on one or more servers using --registry and -u/--username. When logging in to several servers, each result is reported separately and the command fails with a summary if any server failed.
  • check <server_uuid> <registry> checks that the saved login still works.
  • logout <server_uuid> <registry> runs docker logout. It asks for confirmation unless -f/--force is given.
• Password handling: there is no flag for the password. It is read from stdin with --password-stdin, which strips only one trailing newline like docker login. Otherwise it is read from a hidden prompt when running in a terminal. The password is sent only in the JSON request body and is capped at 20,000 bytes to match the API limit.
• Registry input is normalized before use, so https://GHCR.io/ becomes ghcr.io. Registry values are escaped as a single URL path segment, and hosts with ports like registry.example.com:5000 work.
• Debug logging now redacts password fields as well as token fields.
• Updates README.md and llms-full.txt with the new commands.
• Adds tests for the service layer and the commands: table, JSON and sensitive output, stdin and TTY password input, validation, multi-server login, logout confirmation and API error messages.