feat: complete dynamic domain handling (#3482)

* feat: dynamic issuer

* feat: default language from context

* remove zitadel docs from defaults

* remove ConsoleOverwriteDir

* remove notification endpoints from defaults

* custom domains in emails

* remove (external) domain

* external domain completely removed, console handling fixed

* fix test

* fix defaults.yaml

internal/config/systemdefaults/system_defaults.go

@@ -3,15 +3,10 @@ package systemdefaults
 import (
 	"time"
 
-	"golang.org/x/text/language"
-
 	"github.com/caos/zitadel/internal/crypto"
 )
 
 type SystemDefaults struct {
-	DefaultLanguage    language.Tag
-	Domain             string
-	ZitadelDocs        ZitadelDocs
 	SecretGenerators   SecretGenerators
 	Multifactors       MultifactorConfig
 	DomainVerification DomainVerification
@@ -19,11 +14,6 @@ type SystemDefaults struct {
 	KeyConfig          KeyConfig
 }
 
-type ZitadelDocs struct {
-	Issuer            string
-	DiscoveryEndpoint string
-}
-
 type SecretGenerators struct {
 	PasswordSaltCost   int
 	MachineKeySize     uint32
@@ -43,18 +33,9 @@ type DomainVerification struct {
 }
 
 type Notifications struct {
-	Endpoints      Endpoints
 	FileSystemPath string
 }
 
-type Endpoints struct {
-	InitCode                 string
-	PasswordReset            string
-	VerifyEmail              string
-	DomainClaimed            string
-	PasswordlessRegistration string
-}
-
 type KeyConfig struct {
 	Size               int
 	PrivateKeyLifetime time.Duration