fix:Chinese i18n

[Iamliuxiaozhen]

The official Chinese name for token is '词元' rather than the literal translation of token, '令牌'.

[graykode]

security looks clean — this is only zh locale string updates, with no network/shell/dependency/workflow changes. I’d hold this until the terminology change is complete: the zh locale still renders col.tokens as Token and context.token_rate as Token 速率 in src/locale.rs, so users will still see the old English token label in the session table and context panel. cargo test and cargo clippy -- -D warnings pass locally.