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/http/handler/showcase.go

@@ -0,0 +1,45 @@
+package handler
+
+import (
+	"net/http"
+
+	"backend/internal/service"
+	"github.com/gin-gonic/gin"
+)
+
+type ShowcaseHandler struct {
+	showcase *service.ShowcaseService
+}
+
+func NewShowcaseHandler(showcase *service.ShowcaseService) *ShowcaseHandler {
+	return &ShowcaseHandler{showcase: showcase}
+}
+
+func (h *ShowcaseHandler) List(c *gin.Context) {
+	grouped, err := h.showcase.Grouped(c.Request.Context())
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"detail": "failed to load showcase"})
+		return
+	}
+	out := gin.H{}
+	for kind, items := range grouped {
+		rows := make([]gin.H, 0, len(items))
+		for _, item := range items {
+			rows = append(rows, gin.H{
+				"id":         item.ID,
+				"kind":       item.Kind,
+				"title":      item.Title,
+				"subtitle":   item.Subtitle,
+				"prompt":     item.Prompt,
+				"gradient":   item.Gradient,
+				"span":       item.Span,
+				"image":      item.Image,
+				"weight":     item.Weight,
+				"created_at": item.CreatedAt,
+				"updated_at": item.UpdatedAt,
+			})
+		}
+		out[kind] = rows
+	}
+	c.JSON(http.StatusOK, gin.H{"data": out})
+}