refactor(auth): replace dashboard sessions with stateless tokens and session control (#6329)

* refactor(auth): replace dashboard sessions with stateless tokens

* feat(auth): harden session issuance and distributed enforcement

* fix(proxy): preserve trusted proxy compatibility defaults

* refactor: address dashboard auth review feedback

* refactor: remove classic frontend and flatten web app

controller/return_path.go

@@ -3,11 +3,10 @@ package controller
 import (
 	"strings"
 
-	"github.com/QuantumNous/new-api/common"
 	"github.com/QuantumNous/new-api/setting/system_setting"
 )
 
 func paymentReturnPath(suffix string) string {
 	base := strings.TrimRight(system_setting.ServerAddress, "/")
-	return base + common.ThemeAwarePath(suffix)
+	return base + suffix
 }