Extract organization, member, and invitation CLI domains

[sdairs]

Parent: #318

Stack position: 3 of 6.

Goal

Extract organizations, members, and invitations into one complete organization-access domain module.

Scope

• Move organization, member, and invitation clap enums/arguments and exhaustive write classification.
• Move organization usage/Prometheus, member, invitation, and organization CRUD handlers, builders, output, and tests.
• Move corresponding CloudClient wrapper methods into a domain-local impl CloudClient block.
• Keep organization-resolution entry points available to other domains through the shared runtime boundary.
• Re-export moved clap types through cloud::cli.

Acceptance

• Legacy positional organization-ID parsing remains covered and unchanged.
• Organization list/get wrappers remain usable by shared org resolution and service deletion.
• Organization-only formatting helpers remain local to this module.
• No organization/member/invitation handler remains in commands.rs.
• Existing clap, builder, subprocess, and output behavior tests pass.
• Clippy, rustfmt, and workspace checking pass.

Out of scope

• Service and ClickPipes extraction.
• Any API request, command-line, or output behavior change.