feat: 新增平台客服角色与客服查询菜单

backend/internal/model/merchant.go

@@ -24,6 +24,7 @@ const (
 	MemberRoleOperator = "operator"
 	MemberRoleFinance  = "finance"
 	MemberRoleViewer   = "viewer"
+	MemberRoleSupport  = "support"
 
 	PermissionMembersManage   = "members:manage"
 	PermissionProductsManage  = "products:manage"

backend/internal/model/models.go

@@ -8,8 +8,9 @@ import (
 
 // 用户角色
 const (
-	RoleAdmin    = "admin"    // 平台管理员
-	RoleMerchant = "merchant" // 商户账号
+	RoleAdmin           = "admin"            // 平台管理员
+	RoleMerchant        = "merchant"         // 商户账号
+	RolePlatformSupport = "platform_support" // 平台客服
 )
 
 // User 系统用户