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>

http/controller/api/login.go

@@ -16,13 +16,13 @@ import (
 type Login struct {
 }
 
-// Login 登录
-// @Tags 登录
-// @Summary 登录
-// @Description 登录
+// Login login
+// @Tags login
+// @Summary login
+// @Description login
 // @Accept  json
 // @Produce  json
-// @Param body body api.LoginForm true "登录表单"
+// @Param body body api.LoginForm true "login form"
 // @Success 200 {object} apiResp.LoginRes
 // @Failure 500 {object} response.ErrorResponse
 // @Router /login [post]
@@ -32,7 +32,7 @@ func (l *Login) Login(c *gin.Context) {
 		return
 	}
 
-	// 检查登录限制
+	// check login limit
 	loginLimiter := global.LoginLimiter
 	clientIp := c.ClientIP()
 
@@ -68,7 +68,7 @@ func (l *Login) Login(c *gin.Context) {
 		return
 	}
 
-	//根据refer判断是webclient还是app
+	// determine whether it is webclient or app based on refer
 	ref := c.GetHeader("referer")
 	if ref != "" {
 		f.DeviceInfo.Type = model.LoginLogClientWeb
@@ -92,9 +92,9 @@ func (l *Login) Login(c *gin.Context) {
 }
 
 // LoginOptions
-// @Tags 登录
-// @Summary 登录选项
-// @Description 登录选项
+// @Tags login
+// @Summary login options
+// @Description login options
 // @Accept  json
 // @Produce  json
 // @Success 200 {object} []string
@@ -123,9 +123,9 @@ func (l *Login) LoginOptions(c *gin.Context) {
 }
 
 // Logout
-// @Tags 登录
-// @Summary 登出
-// @Description 登出
+// @Tags login
+// @Summary logout
+// @Description logout
 // @Accept  json
 // @Produce  json
 // @Success 200 {string} string