SSH Keys (under server)

[fbarrento]

What to build

First nested-under-server resource. Establishes the deep-nesting pattern ($forge->server($id)->sshKeys()->...) that subsequent under-server resources will reuse.

Endpoints (consult docs/forge.openapi.json for the exact paths — Forge has both a server-level SSH key endpoint and per-user keys under each server):

• list SSH keys on a server
• get one
• create
• delete

(SSH keys typically don't have an update operation.)

Source design: see project_sdk_design.md in the project's memory.

Acceptance criteria

• SshKey DTO (readonly, JsonSerializable, ::from(array))
• CreateSshKeyData input DTO
• ListSshKeysOptions DTO (pagination, sort, any filters)
• Request classes for each SSH-key endpoint
• SshKeysResource (collection: all, iterate, create) and SshKeyResource (item: get, delete)
• $forge->server($id)->sshKeys()->all() etc. — URL composition for the nested path works correctly
• Tests against mocked responses, including URL assertions
• composer test green

Blocked by

• Blocked by Hybrid org context + Servers CRUD #5