feat(cli): add administrator invitation controls

[Ghost-Frame]

Summary

• add typed administrator invitation queue, review, and issuance client operations
• add frameshift account invite-requests, review-invite-request, and issue-invite with closed states and bounded queue limits
• retain one-time invitation tokens as secrets until deliberate structured standard output

Verification

• cargo fmt --all -- --check
• git diff --check
• cargo test -p frameshift-client -p frameshift-cli --no-default-features
• cargo clippy --locked --workspace --all-targets -- -D warnings