[codex] Add SwiftFormat checks and Git hooks

[ygsgdbd]

Summary

• pin SwiftFormat 0.62.1 with a conservative repository configuration and checksum-verified CI download
• add just commands for setup, formatting, linting, testing, and combined checks
• add a repository-managed pre-commit hook that formats fully staged Swift files and safely rejects partially staged files
• add parallel PR checks for formatting and the complete XCTest suite
• apply the initial mechanical SwiftFormat baseline and document setup in English and Chinese

Developer workflow

brew install just swiftformat tuist
just setup
just check

Local commands only validate installed tools and configure the hook; they do not install or upgrade software.

Validation

• just lint: 0/28 files require formatting, 7 generated paths skipped
• just test: 140 tests, 0 failures
• actionlint .github/workflows/pr-checks.yml
• pre-commit verification for no Swift changes, formatted staged files, unformatted staged files, and partially staged files
• SwiftFormat missing, older, newer, and exact-version checks
• git diff --check origin/main...HEAD

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