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/handler/auth/forgotPasswordHandler.go

@@ -1,32 +0,0 @@
-// Code scaffolded by goctl. Safe to edit.
-// goctl 1.9.2
-
-package auth
-
-import (
-	"net/http"
-
-	"github.com/zeromicro/go-zero/rest/httpx"
-	"juwan-backend/app/users/api/internal/logic/auth"
-	"juwan-backend/app/users/api/internal/svc"
-	"juwan-backend/app/users/api/internal/types"
-)
-
-// 忘记密码-发送验证码
-func ForgotPasswordHandler(svcCtx *svc.ServiceContext) http.HandlerFunc {
-	return func(w http.ResponseWriter, r *http.Request) {
-		var req types.ForgotPasswordReq
-		if err := httpx.Parse(r, &req); err != nil {
-			httpx.ErrorCtx(r.Context(), w, err)
-			return
-		}
-
-		l := auth.NewForgotPasswordLogic(r.Context(), svcCtx)
-		resp, err := l.ForgotPassword(&req)
-		if err != nil {
-			httpx.ErrorCtx(r.Context(), w, err)
-		} else {
-			httpx.OkJsonCtx(r.Context(), w, resp)
-		}
-	}
-}