Emergency Pause ("Circuit Breaker") for Entire Contract

[Luluameh]

Background
If a critical zero-day exploit is discovered, admins must be able to halt all new sessions and deposits immediately to protect user funds.
Goal
Implement a platform-wide emergency pause mechanism controlled by SuperAdmin.
Acceptance Criteria

• emergency_pause() and emergency_unpause() functions.
• Check is_paused at the beginning of start_session, initialize_session, and reserve_session.
• Settles and withdrawals are not paused during emergency to allow users to retrieve their funds safely.
  Key Files
  contracts/src/admin.rs, contracts/src/lib.rs

[mikevill20]

@mikevill20 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hello maintainer, please assign this issue to me. Thanks.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @mikevill20 to this issue.

[Babigdk]

@Babigdk has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Kindly assign me to work on this issue 🙏

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Babigdk to this issue.