feat(invoice): add send route

pkg/invoice/resource.go

@@ -0,0 +1,34 @@
+package invoice
+
+import (
+	"io"
+	"log/slog"
+
+	"code.gitea.io/sdk/gitea"
+)
+
+type Repo struct {
+	Owner string `json:"owner"`
+	Repo  string `json:"repo"`
+}
+
+type Service struct {
+	log   *slog.Logger
+	gitea giteaClient
+	pdf   pdfGenerator
+}
+
+func New(log *slog.Logger, gitea giteaClient, pdf pdfGenerator) *Service {
+	return &Service{
+		log:   log,
+		gitea: gitea,
+		pdf:   pdf,
+	}
+}
+
+type giteaClient interface {
+	ListRepoIssues(owner, repo string, opt gitea.ListIssueOption) ([]*gitea.Issue, *gitea.Response, error)
+}
+type pdfGenerator interface {
+	HtmlToPdf(html string) (pdf io.ReadCloser, err error)
+}