feat: add realm role get/delete and client-scoped roles

[NathaelB]

Summary

• realm role get <name> [--client <client_id>] — look up a realm or client role by name.
• realm role delete <name> [--client <client_id>] — delete a realm or client role (confirmation prompt, --force to skip).
• --client <client_id> on role create and role list — reach client roles, not just realm roles.
• New client methods: delete_role, list_client_roles, following the realms/{realm}/[clients/{uuid}/]roles[/{id}] convention used elsewhere. create_client_role was already there but decoded its response as an enveloped {"data": ...} payload like create_role — turns out that endpoint returns the role as a bare object; fixed. There's no client-scoped delete endpoint — role ids are unique across realm and client scopes, so plain delete_role deletes both; dropped the delete_client_role method I'd initially guessed at.

Issue

Closes #22.

Verification

Verified live against a local FerrisKey server (create/get/list/delete, both realm-scoped and client-scoped roles) — not just unit tests. Caught and fixed one real bug in the process (the create_client_role envelope mismatch above) and dropped one endpoint that doesn't exist server-side.

Test plan

• cargo build --workspace
• cargo test --workspace (60 passed)
• cargo clippy --workspace --all-targets --all-features -- -D warnings
• Manual smoke test against a running FerrisKey server: role create/get/list/delete, realm-scoped and --client-scoped, then cleaned up the test fixtures

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📥 Commits

Reviewing files that changed from the base of the PR and between fabf9e6 and 640fe73.

📒 Files selected for processing (4)

• libs/ferriskey-cli-client/src/lib.rs
• libs/ferriskey-cli-commands/src/lib.rs
• libs/ferriskey-cli-commands/src/realm.rs
• libs/ferriskey-cli-core/src/realm.rs

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