fix: unify user ID type to string and rename service to users-api

app/users/api/internal/logic/user/unfollowUserLogic.go

@@ -6,6 +6,8 @@ package user
 import (
 	"context"
 	"errors"
+	"strconv"
+
 	"juwan-backend/app/users/rpc/usercenter"
 	"juwan-backend/common/utils/contextj"
 
@@ -31,14 +33,18 @@ func NewUnfollowUserLogic(ctx context.Context, svcCtx *svc.ServiceContext) *Unfo
 }
 
 func (l *UnfollowUserLogic) UnfollowUser(req *types.UnfollowUserReq) (resp *types.EmptyResp, err error) {
-	// todo: add your logic here and delete this line
 	userId, err := contextj.UserIDFrom(l.ctx)
 	if err != nil {
 		return nil, errors.New("unauthorized")
 	}
 
+	targetId, err := strconv.ParseInt(req.Id, 10, 64)
+	if err != nil {
+		return nil, errors.New("invalid user id")
+	}
+
 	_, err = l.svcCtx.UserRpc.DelUserFollows(l.ctx, &usercenter.DelUserFollowsReq{
-		Id:     req.Id,
+		Id:     targetId,
 		UserId: userId,
 	})
 	if err != nil {