chore: remove auto IDNA conversion in domain rules

The original upstream does not support it, and there are many places in the current code that do not support it either. Removing it will help maintain consistency in behavior across different parts.

rules/common/domain.go

@@ -4,7 +4,6 @@ import (
 	"strings"
 
 	C "github.com/metacubex/mihomo/constant"
-	"golang.org/x/net/idna"
 )
 
 type Domain struct {
@@ -30,10 +29,9 @@ func (d *Domain) Payload() string {
 }
 
 func NewDomain(domain string, adapter string) *Domain {
-	punycode, _ := idna.ToASCII(strings.ToLower(domain))
 	return &Domain{
 		Base:    Base{},
-		domain:  punycode,
+		domain:  strings.ToLower(domain),
 		adapter: adapter,
 	}
 }

rules/common/domain_keyword.go

@@ -4,7 +4,6 @@ import (
 	"strings"
 
 	C "github.com/metacubex/mihomo/constant"
-	"golang.org/x/net/idna"
 )
 
 type DomainKeyword struct {
@@ -31,10 +30,9 @@ func (dk *DomainKeyword) Payload() string {
 }
 
 func NewDomainKeyword(keyword string, adapter string) *DomainKeyword {
-	punycode, _ := idna.ToASCII(strings.ToLower(keyword))
 	return &DomainKeyword{
 		Base:    Base{},
-		keyword: punycode,
+		keyword: strings.ToLower(keyword),
 		adapter: adapter,
 	}
 }

rules/common/domain_suffix.go

@@ -4,7 +4,6 @@ import (
 	"strings"
 
 	C "github.com/metacubex/mihomo/constant"
-	"golang.org/x/net/idna"
 )
 
 type DomainSuffix struct {
@@ -31,10 +30,9 @@ func (ds *DomainSuffix) Payload() string {
 }
 
 func NewDomainSuffix(suffix string, adapter string) *DomainSuffix {
-	punycode, _ := idna.ToASCII(strings.ToLower(suffix))
 	return &DomainSuffix{
 		Base:    Base{},
-		suffix:  punycode,
+		suffix:  strings.ToLower(suffix),
 		adapter: adapter,
 	}
 }