[Feat] optional expired time

[tanut32039]

• If tss expired time is null -> not check expired time

[Copilot]

Pull request overview

Adds support for optional TSS group expiration, allowing verification to proceed when a group has no configured expiry time.

Changes:

• Change tss.groups[].expired_time from u64 to Option<u64> in config model.
• Update TSS signature verification to skip expiry checks when expired_time is None.
• Update verifier tests to construct Group with expired_time: Some(...).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/verifier/tss/signature.rs	Adjust expiry check logic to handle Option<u64> and update tests’ group construction.
src/config/tss/group.rs	Make expired_time optional in the config schema (Option<u64>).

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