[bugfix/backend] use int64 in userid

backend/internal/handler/user.go

@@ -176,6 +176,18 @@ func (h *Handler) GetCurrentUser(c *gin.Context) {
 		id = int64(v)
 	case float64:
 		id = int64(v)
+	case string:
+		// 尝试将字符串转换为int64
+		parsedID, err := strconv.ParseInt(v, 10, 64)
+		if err != nil {
+			log.Error().
+				Err(err).
+				Str("user_id", v).
+				Msg("Failed to parse user_id string")
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "Invalid user_id format"})
+			return
+		}
+		id = parsedID
 	default:
 		log.Error().
 			Str("type", fmt.Sprintf("%T", userID)).