feat(issue-114): add admin freeze clawback smoke tests

[mxllv]

Summary

Added contract-level smoke coverage for admin rotation, freeze and unfreeze behavior, and clawback through VeritixTokenClient so these security-sensitive entrypoints are exercised through the public contract interface.

Changes

• Activated the existing admin/freeze state smoke test so it now runs in the normal suite
• Added a new public-client smoke test covering admin rotation, freeze/unfreeze, and clawback in one flow
• Removed redundant helper-level admin auth checks in freeze.rs because the public contract entrypoints already enforce admin authorization and the duplicate check aborted the active client smoke path
• Files affected: veritixpay/contract/token/src/test.rs, veritixpay/contract/token/src/freeze.rs

Validation

• cd veritixpay/contract/token && cargo +stable build
• cd veritixpay/contract/token && cargo +stable test test_admin_and_freeze_views_follow_state_changes
• cd veritixpay/contract/token && cargo +stable test test_admin_freeze_and_clawback_smoke_via_client
• cd veritixpay/contract/token && cargo +stable test
• Results: build passed; both targeted tests passed; full test suite passed (21 passed, 15 ignored)

Mismatch Handling (if applicable)

• The admin/freeze smoke path exposed a mismatch in the current repo: freeze and unfreeze already authenticate the admin in contract.rs, but freeze.rs repeated require_auth() again and caused the active Soroban client smoke tests to abort
• Added only the smallest viable scaffold by removing the redundant helper-level auth and leaving the public authorization boundary in contract.rs
• The solution was kept minimal so the branch stayed focused on enabling the required smoke coverage without broad authorization refactors

Notes

• This branch intentionally covers the public happy-path smoke behavior only
• Negative-path authorization coverage remains separate from this issue’s scope

Closes #114

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