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>

model/shareRecord.go

@@ -11,7 +11,7 @@ type ShareRecord struct {
 	TimeModel
 }
 
-// ShareRecordList 分享记录列表
+// ShareRecordList share record list
 type ShareRecordList struct {
 	ShareRecords []*ShareRecord `json:"list,omitempty"`
 	Pagination