fix: 密码重置链路断裂与店铺模板类型不兼容

删除 users-api 的 forgot-password 空壳路由，email-api 的
forgotPasswordLogic 复用 sendVerificationCode 实现。shop 的
UpdateTemplateReq.Sections 从 interface{} 改为 string 以兼容
go-zero 反序列化。ResetPasswordReq.Phone 加 optional tag。

app/users/api/internal/logic/auth/forgotPasswordLogic.go

@@ -1,33 +0,0 @@
-// Code scaffolded by goctl. Safe to edit.
-// goctl 1.9.2
-
-package auth
-
-import (
-	"context"
-	"juwan-backend/app/users/api/internal/svc"
-	"juwan-backend/app/users/api/internal/types"
-
-	"github.com/zeromicro/go-zero/core/logx"
-)
-
-type ForgotPasswordLogic struct {
-	logx.Logger
-	ctx    context.Context
-	svcCtx *svc.ServiceContext
-}
-
-// 忘记密码-发送验证码
-func NewForgotPasswordLogic(ctx context.Context, svcCtx *svc.ServiceContext) *ForgotPasswordLogic {
-	return &ForgotPasswordLogic{
-		Logger: logx.WithContext(ctx),
-		ctx:    ctx,
-		svcCtx: svcCtx,
-	}
-}
-
-func (l *ForgotPasswordLogic) ForgotPassword(req *types.ForgotPasswordReq) (resp *types.EmptyResp, err error) {
-	// todo: add your logic here and delete this line
-
-	return
-}