fix: align admin behavior and Kratos integrations

internal/server/handler/session.go

@@ -1,8 +1,6 @@
 package handler
 
 import (
-	"net/http"
-
 	"kra/internal/server/httpx"
 	"kra/internal/service"
 
@@ -21,6 +19,6 @@ func (h *Session) Logout(c *gin.Context) {
 		httpx.Fail(c, "退出失败")
 		return
 	}
-	http.SetCookie(c.Writer, &http.Cookie{Name: "x-token", Value: "", Path: "/", MaxAge: -1, HttpOnly: true})
+	httpx.SetTokenCookie(c, "", -1)
 	httpx.OK(c)
 }