Initial open-source release (MIT): image2api AI gateway

Full Go backend + Vue 3 frontend, OpenAI-compatible API, multi-provider
account pools, billing/admin, Docker one-command deploy with auto HTTPS.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/internal/service/showcase.go

@@ -0,0 +1,20 @@
+package service
+
+import (
+	"context"
+
+	"backend/internal/model"
+	"backend/internal/repo"
+)
+
+type ShowcaseService struct {
+	repo *repo.ShowcaseRepository
+}
+
+func NewShowcaseService(repo *repo.ShowcaseRepository) *ShowcaseService {
+	return &ShowcaseService{repo: repo}
+}
+
+func (s *ShowcaseService) Grouped(ctx context.Context) (map[string][]model.ShowcaseItem, error) {
+	return s.repo.Grouped(ctx)
+}