修复：管理员默认商户与账户设置

backend/internal/handler/auth.go

@@ -49,6 +49,13 @@ type changePasswordReq struct {
 	NewPassword     string `json:"new_password" binding:"required,min=8"`
 }
 
+type updateCurrentAccountReq struct {
+	CurrentPassword string `json:"current_password" binding:"required"`
+	Username        string `json:"username" binding:"required"`
+	Nickname        string `json:"nickname"`
+	NewPassword     string `json:"new_password" binding:"omitempty,min=8"`
+}
+
 func (h *AuthHandler) ChangePassword(c *gin.Context) {
 	var req changePasswordReq
 	if err := c.ShouldBindJSON(&req); err != nil {
@@ -61,3 +68,22 @@ func (h *AuthHandler) ChangePassword(c *gin.Context) {
 	}
 	response.OK(c, nil)
 }
+
+func (h *AuthHandler) UpdateCurrentAccount(c *gin.Context) {
+	var req updateCurrentAccountReq
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, "请填写用户名和当前密码；新密码至少 8 位")
+		return
+	}
+	user, err := h.svc.UpdateCurrentAccount(middleware.GetUserID(c), service.UpdateCurrentAccountInput{
+		CurrentPassword: req.CurrentPassword,
+		Username:        req.Username,
+		Nickname:        req.Nickname,
+		NewPassword:     req.NewPassword,
+	})
+	if err != nil {
+		response.BadRequest(c, err.Error())
+		return
+	}
+	response.OK(c, user)
+}