handlers区分backend和frontend，需要确认。

middleware/auth.go

@@ -1,11 +1,10 @@
 package middleware
 
 import (
+	"goblog/handlers/backend"
 	"net/http"
 	"strings"
 
-	"goblog/handlers"
-
 	"github.com/gin-gonic/gin"
 	"github.com/golang-jwt/jwt/v5"
 )
@@ -36,10 +35,10 @@ func JWTAuth() gin.HandlerFunc {
 			return
 		}
 
-		claims := &handlers.Claims{}
+		claims := &backend.Claims{}
 
 		token, err := jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {
-			return handlers.JWTSecret(), nil
+			return backend.JWTSecret(), nil
 		})
 
 		if err != nil || !token.Valid {
@@ -77,10 +76,10 @@ func OptionalAuth() gin.HandlerFunc {
 			return
 		}
 
-		claims := &handlers.Claims{}
+		claims := &backend.Claims{}
 
 		token, err := jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {
-			return handlers.JWTSecret(), nil
+			return backend.JWTSecret(), nil
 		})
 
 		if err == nil && token.Valid {