i18n: Translate all Chinese to English across the codebase
Translate Chinese comments, log/error messages, validator labels and Swagger annotations to English throughout the source code, generated Swagger docs, config files and CI workflows. Make the English README primary: README.md now holds the English docs and README_EN.md holds the Chinese version, with cross-language links updated accordingly. Note: the generated docs/ swagger files were translated in place; run `go generate ./...` (swag init) to regenerate them from the now-English annotations when a Go toolchain is available. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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