docs(release): add v0.8.0 release notes

[ygsgdbd]

Summary

• add bilingual TypeSwitch v0.8.0 release notes based on the complete v0.7.1...main diff
• document silent update availability checks, menu wording and section improvements, documentation updates, and PR quality gates
• keep the release change scoped to CHANGELOG.md

Validation

• pinned SwiftFormat 0.62.1 lint: 0/43 files require formatting
• git diff --check
• release workflow awk extraction for v0.8.0
• GitHub PR Format and Tests checks are the authoritative full-suite gate because local Tuist was terminated by the host with SIGKILL before project generation completed

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