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>

lib/jwt/jwt_test.go

@@ -34,30 +34,30 @@ Hj4yO4j5LOWDMTgDcLsZTxbGiTzkNc/HghrNIevDAQdgjJQNl84zDjyyCA4r/MA7
 bYJTtYj8q6J0EDbRdT9b6hMclyzjNXdx2loJxR0R8WUeL1lDEPq8
 -----END RSA PRIVATE KEY-----`
 
-// 测试token生成
+// test token generation
 func TestGenerateToken(t *testing.T) {
 	jwtService := NewJwt(pk, time.Second*1000)
 	token := jwtService.GenerateToken(1)
 	if token == "" {
-		t.Fatal("token生成失败")
+		t.Fatal("token generation failed")
 	}
 	fmt.Println(pk, token)
 }
 
-// 测试token解析
+// test token parsing
 func TestParseToken(t *testing.T) {
 	jwtService := NewJwt(pk, time.Second*1000)
 	token := jwtService.GenerateToken(999)
 	if token == "" {
-		t.Fatal("token生成失败")
+		t.Fatal("token generation failed")
 	}
 	uid, err := jwtService.ParseToken(token)
 	if err != nil {
 
-		t.Fatal("token解析失败", err)
+		t.Fatal("token parsing failed", err)
 	}
 	if uid != 999 {
-		t.Fatal("token解析失败")
+		t.Fatal("token parsing failed")
 	}
 }