功能：优化账号分层与管理员初始化

backend/internal/handler/user.go

@@ -43,6 +43,17 @@ func (h *UserHandler) List(c *gin.Context) {
 	response.Page(c, list, total, page, size)
 }
 
+func (h *UserHandler) ListMerchantMembers(c *gin.Context) {
+	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+	size, _ := strconv.Atoi(c.DefaultQuery("size", "20"))
+	list, total, err := h.svc.ListMerchantMembers(page, size)
+	if err != nil {
+		response.ServerError(c, err.Error())
+		return
+	}
+	response.Page(c, list, total, page, size)
+}
+
 type createUserReq struct {
 	Username string `json:"username" binding:"required"`
 	Password string `json:"password" binding:"required,min=6"`
@@ -82,6 +93,24 @@ func (h *UserHandler) UpdateStatus(c *gin.Context) {
 	response.OK(c, nil)
 }
 
+type userRoleReq struct {
+	Role string `json:"role" binding:"required"`
+}
+
+func (h *UserHandler) UpdateRole(c *gin.Context) {
+	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
+	var req userRoleReq
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, "参数错误：角色必填")
+		return
+	}
+	if err := h.svc.UpdateRole(uint(id), req.Role, middleware.GetUserID(c)); err != nil {
+		response.BadRequest(c, err.Error())
+		return
+	}
+	response.OK(c, nil)
+}
+
 func (h *UserHandler) Delete(c *gin.Context) {
 	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
 	if err := h.svc.Delete(uint(id), middleware.GetUserID(c)); err != nil {