feat: add stable release updater

[Kisechan]

Summary

• Add recall update and recall update --check for stable GitHub Releases.
• Download the current-platform release asset with terminal progress, SHA-256 verification, and archive extraction.
• Replace binaries atomically on macOS/Linux and after process exit on Windows.
• Check for stable updates from the history TUI at most once per 24 hours.
• Document the update workflow in English and Simplified Chinese.

Testing

• cargo fmt --check
• cargo build --release
• target/release/recall update --check
• cargo test
• cargo clippy --all-targets -- -D warnings

[chatgpt-codex-connector]

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[Kisechan]

Addressed in 6bc448d.

The TUI now starts from cached update state and refreshes stale checks in the background. Failed checks are cached for 24 hours while preserving a known available version.

Windows updates now report a staged state and retry replacement after the recall process and proxy release recall.exe.

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 6bc448d92f

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