Refactor codebase, introduce relaymode package, update constants and improve consistency

- Refactor constant definitions and organization
- Clean up package level variables and functions
- Introduce new `relaymode` and `apitype` packages for constant definitions
- Refactor and simplify code in several packages including `openai`, `relay/channel/baidu`, `relay/util`, `relay/controller`, `relay/channeltype`
- Add helper functions in `relay/channeltype` package to convert channel type constants to corresponding API type constants
- Remove deprecated functions such as `ResponseText2Usage` from `relay/channel/openai/helper.go`
- Modify code in `relay/util/validation.go` and related files to use new `validator.ValidateTextRequest` function
- Rename `util` package to `relaymode` and update related imports in several packages

model/channel.go

@@ -3,13 +3,19 @@ package model
 import (
 	"encoding/json"
 	"fmt"
-	"github.com/songquanpeng/one-api/common"
 	"github.com/songquanpeng/one-api/common/config"
 	"github.com/songquanpeng/one-api/common/helper"
 	"github.com/songquanpeng/one-api/common/logger"
 	"gorm.io/gorm"
 )
 
+const (
+	ChannelStatusUnknown          = 0
+	ChannelStatusEnabled          = 1 // don't use 0, 0 is the default value!
+	ChannelStatusManuallyDisabled = 2 // also don't use 0
+	ChannelStatusAutoDisabled     = 3
+)
+
 type Channel struct {
 	Id                 int     `json:"id"`
 	Type               int     `json:"type" gorm:"default:0"`
@@ -39,7 +45,7 @@ func GetAllChannels(startIdx int, num int, scope string) ([]*Channel, error) {
 	case "all":
 		err = DB.Order("id desc").Find(&channels).Error
 	case "disabled":
-		err = DB.Order("id desc").Where("status = ? or status = ?", common.ChannelStatusAutoDisabled, common.ChannelStatusManuallyDisabled).Find(&channels).Error
+		err = DB.Order("id desc").Where("status = ? or status = ?", ChannelStatusAutoDisabled, ChannelStatusManuallyDisabled).Find(&channels).Error
 	default:
 		err = DB.Order("id desc").Limit(num).Offset(startIdx).Omit("key").Find(&channels).Error
 	}
@@ -168,7 +174,7 @@ func (channel *Channel) LoadConfig() (map[string]string, error) {
 }
 
 func UpdateChannelStatusById(id int, status int) {
-	err := UpdateAbilityStatus(id, status == common.ChannelStatusEnabled)
+	err := UpdateAbilityStatus(id, status == ChannelStatusEnabled)
 	if err != nil {
 		logger.SysError("failed to update ability status: " + err.Error())
 	}
@@ -199,6 +205,6 @@ func DeleteChannelByStatus(status int64) (int64, error) {
 }
 
 func DeleteDisabledChannel() (int64, error) {
-	result := DB.Where("status = ? or status = ?", common.ChannelStatusAutoDisabled, common.ChannelStatusManuallyDisabled).Delete(&Channel{})
+	result := DB.Where("status = ? or status = ?", ChannelStatusAutoDisabled, ChannelStatusManuallyDisabled).Delete(&Channel{})
 	return result.RowsAffected, result.Error
 }