feat: add backend_v1 migration

backend_v1/app/grpc/users/handler.go

@@ -0,0 +1,26 @@
+package users
+
+import (
+	"context"
+
+	userv1 "quyun/v2/pkg/proto/user/v1"
+)
+
+// @provider(grpc) userv1.RegisterUserServiceServer
+type Users struct {
+	userv1.UnimplementedUserServiceServer
+}
+
+func (u *Users) ListUsers(ctx context.Context, in *userv1.ListUsersRequest) (*userv1.ListUsersResponse, error) {
+	// userv1.UserServiceServer
+	return &userv1.ListUsersResponse{}, nil
+}
+
+// GetUser implements userv1.UserServiceServer
+func (u *Users) GetUser(ctx context.Context, in *userv1.GetUserRequest) (*userv1.GetUserResponse, error) {
+	return &userv1.GetUserResponse{
+		User: &userv1.User{
+			Id: in.Id,
+		},
+	}, nil
+}