fix: Upgrade error handling to errors/v2 package and refactor error messages.

- Refactor error handling using `errors/v2` package for improved error management and formatting
- Implement changes in relay/controller/text.go, controller/channel-test.go, controller/relay.go, common/message/email.go, relay/controller/audio.go, controller/channel-billing.go, relay/controller/helper.go, relay/channel/common.go, relay/channel/minimax/main.go, and common/message/main.go
- Add package imports and update package paths for better code organization
- Replace hardcoded strings with error variables for consistency and readability
- Implement secure methods for generating unique Message-ID
- Improve SMTP handling and authentication in email.go
- Update response handling and error messages for better user experience
- Add constant checks and modify functions based on imageRequest parameters in helper.go
- Use `http.NewRequest` instead of `fmt.Fprint` for improved request handling in relay/channel/common.go
- Update error handling and formatting for better consistency across all files

common/message/email.go

@@ -5,15 +5,17 @@ import (
 	"crypto/tls"
 	"encoding/base64"
 	"fmt"
-	"github.com/songquanpeng/one-api/common/config"
 	"net/smtp"
 	"strings"
 	"time"
+
+	"github.com/Laisky/errors/v2"
+	"github.com/songquanpeng/one-api/common/config"
 )
 
 func SendEmail(subject string, receiver string, content string) error {
 	if receiver == "" {
-		return fmt.Errorf("receiver is empty")
+		return errors.Errorf("receiver is empty")
 	}
 	if config.SMTPFrom == "" { // for compatibility
 		config.SMTPFrom = config.SMTPAccount