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>

service/peer.go

@@ -8,7 +8,7 @@ import (
 type PeerService struct {
 }
 
-// FindById 根据id查找
+// FindById finds a peer by id
 func (ps *PeerService) FindById(id string) *model.Peer {
 	p := &model.Peer{}
 	DB.Where("id = ?", id).First(p)
@@ -25,22 +25,22 @@ func (ps *PeerService) InfoByRowId(id uint) *model.Peer {
 	return p
 }
 
-// FindByUserIdAndUuid 根据用户id和uuid查找peer
+// FindByUserIdAndUuid finds a peer by user id and uuid
 func (ps *PeerService) FindByUserIdAndUuid(uuid string, userId uint) *model.Peer {
 	p := &model.Peer{}
 	DB.Where("uuid = ? and user_id = ?", uuid, userId).First(p)
 	return p
 }
 
-// UuidBindUserId 绑定用户id
+// UuidBindUserId binds a user id
 func (ps *PeerService) UuidBindUserId(deviceId string, uuid string, userId uint) {
 	peer := ps.FindByUuid(uuid)
-	// 如果存在则更新
+	// if it exists, update it
 	if peer.RowId > 0 {
 		peer.UserId = userId
 		ps.Update(peer)
 	} else {
-		// 不存在则创建
+		// create if it does not exist
 		/*if deviceId != "" {
 			DB.Create(&model.Peer{
 				Id:     deviceId,
@@ -51,7 +51,7 @@ func (ps *PeerService) UuidBindUserId(deviceId string, uuid string, userId uint)
 	}
 }
 
-// UuidUnbindUserId 解绑用户id, 用于用户注销
+// UuidUnbindUserId unbinds the user id, used for user logout
 func (ps *PeerService) UuidUnbindUserId(uuid string, userId uint) {
 	peer := ps.FindByUserIdAndUuid(uuid, userId)
 	if peer.RowId > 0 {
@@ -59,12 +59,12 @@ func (ps *PeerService) UuidUnbindUserId(uuid string, userId uint) {
 	}
 }
 
-// EraseUserId 清除用户id, 用于用户删除
+// EraseUserId clears the user id, used for user deletion
 func (ps *PeerService) EraseUserId(userId uint) error {
 	return DB.Model(&model.Peer{}).Where("user_id = ?", userId).Update("user_id", 0).Error
 }
 
-// ListByUserIds 根据用户id取列表
+// ListByUserIds gets the list by user ids
 func (ps *PeerService) ListByUserIds(userIds []uint, page, pageSize uint) (res *model.PeerList) {
 	res = &model.PeerList{}
 	res.Page = int64(page)
@@ -91,11 +91,11 @@ func (ps *PeerService) List(page, pageSize uint, where func(tx *gorm.DB)) (res *
 	return
 }
 
-// ListFilterByUserId 根据用户id过滤Peer列表
+// ListFilterByUserId filters the peer list by user id
 func (ps *PeerService) ListFilterByUserId(page, pageSize uint, where func(tx *gorm.DB), userId uint) (res *model.PeerList) {
 	userWhere := func(tx *gorm.DB) {
 		tx.Where("user_id = ?", userId)
-		// 如果还有额外的筛选条件，执行它
+		// if there are additional filter conditions, apply them
 		if where != nil {
 			where(tx)
 		}
@@ -103,30 +103,30 @@ func (ps *PeerService) ListFilterByUserId(page, pageSize uint, where func(tx *go
 	return ps.List(page, pageSize, userWhere)
 }
 
-// Create 创建
+// Create create
 func (ps *PeerService) Create(u *model.Peer) error {
 	res := DB.Create(u).Error
 	return res
 }
 
-// Delete 删除, 同时也应该删除token
+// Delete deletes a peer; the associated token should also be deleted
 func (ps *PeerService) Delete(u *model.Peer) error {
 	uuid := u.Uuid
 	err := DB.Delete(u).Error
 	if err != nil {
 		return err
 	}
-	// 删除token
+	// delete the token
 	return AllService.UserService.FlushTokenByUuid(uuid)
 }
 
-// GetUuidListByIDs 根据ids获取uuid列表
+// GetUuidListByIDs gets the uuid list by ids
 func (ps *PeerService) GetUuidListByIDs(ids []uint) ([]string, error) {
 	var uuids []string
 	err := DB.Model(&model.Peer{}).
 		Where("row_id in (?)", ids).
 		Pluck("uuid", &uuids).Error
-	//过滤uuids中的空字符串
+	// filter out empty strings in uuids
 	var newUuids []string
 	for _, uuid := range uuids {
 		if uuid != "" {
@@ -136,18 +136,18 @@ func (ps *PeerService) GetUuidListByIDs(ids []uint) ([]string, error) {
 	return newUuids, err
 }
 
-// BatchDelete 批量删除, 同时也应该删除token
+// BatchDelete batch deletes peers; the associated tokens should also be deleted
 func (ps *PeerService) BatchDelete(ids []uint) error {
 	uuids, err := ps.GetUuidListByIDs(ids)
 	err = DB.Where("row_id in (?)", ids).Delete(&model.Peer{}).Error
 	if err != nil {
 		return err
 	}
-	// 删除token
+	// delete the token
 	return AllService.UserService.FlushTokenByUuids(uuids)
 }
 
-// Update 更新
+// Update update
 func (ps *PeerService) Update(u *model.Peer) error {
 	return DB.Model(u).Updates(u).Error
 }